Waterfall terrible service, peerless push bikes useless

Terrible service from your waterfall branch and a really I don't care attitude from the manager. I bought a green peerless push bike for my child, it didn't even last 3 weeks and the back wheel buckled, I took it back, I understand lock down happened. We have now been in lock down level 3 for 3 months. No communication from toys r us about the repair! I have been waiting for over 5 months now. I go in to see them, I got promised someone would contact me on Monday to let me know what is happening with the bike. Of course I receive NO phone call, so I phoned them. I got told I must come collect the bike as it has been repaired. So my mom goes too collect the bike, drives all the way home, my child rides his bike the back wheel falls off, he falls off and hurts himself. They did NOTHING to repair the bike after I was told they replaced the back Tyre. I phoned in to the Manger he really didn't care, I asked if he could replace it, as it didn't even last a month, he told me yeah when they receive stock. Everytime I have been into toys r us, they have stock of the bicycle. I now want a refund!! I have had to go out and buy my child a new bike as that's all he wanted for his birthday. He got the bike in January. The staff told me they have numerous complaints about those bikes. The Manger basically told me he won't help me and I must contact head office. If head office cannot help, I will have to take this matter futher.