Pygame Collision Issue (Pinball)

Im making a pinball game in pygame however im getting an issue with the collision system where the ball just phases through the wall, it detects there is a collision as ive set it to print "collided" however it simply doesnt collide, only with certain points on the border (currently a prototype so only working things are the graphics and ball movement).

import pygame
import math
from sys import exit
pygame.init()


    

#create screen
#Dimentions
screen = pygame.display.set_mode((700, 1000))
screen.fill("White")
#Load background graphics.
background = pygame.image.load('C:/Users/Lucas/Documents/King Edwards/Computer Science/CourseWork/graphics/backgroundImg.png')
background = pygame.transform.scale(background, (700, 870))
pygame.display.set_caption("Pinball")
icon = pygame.image.load('C:/Users/Lucas/Documents/King Edwards/Computer Science/CourseWork/graphics/icon.png')
pygame.display.set_icon(icon)
#Sets the variable for the framerate (which is set at the end of the program)
clock = pygame.time.Clock()

#Ball
#Loads Graphics
ballImg = pygame.image.load("C:/Users/Lucas/Documents/King Edwards/Computer Science/CourseWork/graphics/ball.png")
#Sets size of ball
ballImg = pygame.transform.scale(ballImg, (60, 60))
#Balls position
ballX = 320
ballY = 760
ballY_change = 0
#Directional speed of the ball
x_speed, y_speed = 5,4

#Flipper
#Loads Graphics (flipperImg = right flipper | flipper1Img = left flipper)
flipperImg = pygame.image.load("C:/Users/Lucas/Documents/King Edwards/Computer Science/CourseWork/graphics/flipper.png")
flipperImg = pygame.transform.scale(flipperImg, (164, 45))
#Sets the position of the flippers.
flipperX = 370
flipperY = 800
flipper1Img = pygame.image.load("C:/Users/Lucas/Documents/King Edwards/Computer Science/CourseWork/graphics/flipper1.png")
flipper1Img = pygame.transform.scale(flipper1Img, (164, 45))
flipper1X = 166
flipper1Y = 800

#Slingshot
#Loads Graphics (slingshotImg = right slingshot | slingshot1Img = left slingshot)
slingshotImg = pygame.image.load("C:/Users/Lucas/Documents/King Edwards/Computer Science/CourseWork/graphics/slingshot.png")
slingshotImg = pygame.transform.scale(slingshotImg, (177, 281))
#Sets the position of the slingshots.
slingshotX = 522.5
slingshotY = 590
slingshot1Img = pygame.image.load("C:/Users/Lucas/Documents/King Edwards/Computer Science/CourseWork/graphics/slingshot1.png")
slingshot1Img = pygame.transform.scale(slingshot1Img, (177, 281))
slingshot1X = 0
slingshot1Y = 590

#Draw image
def ball(x,y):
    screen.blit(ballImg, (x,y))
def flippers():
    screen.blit(flipperImg, (flipperX,flipperY))
    screen.blit(flipper1Img, (flipper1X,flipper1Y))
def slingshots():
    screen.blit(slingshotImg, (slingshotX,slingshotY))
    screen.blit(slingshot1Img, (slingshot1X,slingshot1Y))

#Gravity
def gravity():
    global ballY
    ballY += 2.5
#Bounce
def bouncing():
    global x_speed
    global y_speed
    global ballX
    global ballY
    ballX += x_speed
    ballY += y_speed

    if ballX >= 700 or ballY <= 0:
        x_speed *= -1
    if ballY >= 1000 or ballX <= 0:
        y_speed *= -1

#Collisions
def isCollision(ballX,ballY,flipperX,flipperY,flipper1X,flipper1Y):
    distance = math.sqrt((math.pow(ballX - flipperX,2))+ (math.pow(ballY - flipperY,2)))
    distance1 = math.sqrt((math.pow(ballX - flipper1X,2))+ (math.pow(ballY - flipper1Y,2)))
    if distance < 55 or distance1 < 55:
        return True
    else:
        return False

#Game loop
while True:
    screen.fill("Black")
    screen.blit(background, (0,0))
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            exit()

        if event.type == pygame.KEYDOWN:
            print("Keystroke pressed!")
            if event.key == pygame.K_a:
                print("A is pressed.")
                ballX -= 20
            if event.key == pygame.K_d:
                print("D is pressed.")

                
            if event.key == pygame.K_SPACE:
                print("Spacebar is pressed.")
                
        if event.type == pygame.KEYUP:
            if event.key == pygame.K_a or event.key == pygame.K_d or event.key == pygame.K_SPACE:
                print("Key released!")
    #draw elements and update

    #if ballY >= 1000:
        #ballY = 760
        #ballX = 320
        #print("DIED")
    #elif ballY <= 0:
        #ballY = 0
    #if ballX <= 0:
        #ballX = 0
    #elif ballX >= 700:
        #ballX = 700

    #collision
    collision = isCollision(ballX,ballY,flipperX,flipperY,flipper1X,flipper1Y)
    if collision:
        #ballX = 320
        #ballY = 760
        print("COLLIDED!")

    bouncing()
    ball(ballX,ballY)
    flippers()
    slingshots()
    #gravity()
    pygame.display.update()
    clock.tick(60)