Extremely BAD after service with a TV that lasted 4 months

Bought a TV at games Vincent park, east london in december 2020. It's now April and not working which is unbelievable as we have an inverter so damage is not loadshedding. Took the TV back to Game today and because I don't have the slip the young guy behind the counter was so sarcastic. Said it's not his fault I lost my slip and he cant help me. I then demanded the manager of which he said the manager was not available. He sarcastically called the supervisor of which he said she would tell me the same thing he just told me. It's the 1st time I get this horrible service from any store. How can they not have a system that can reprint the slips especially when a customer has spent more than R10000 on one purchase. Its unacceptable that one has to deal with rude staff!!! and to top it off get told they it could take up to 6 months to get a slip and that's only if they can find it!!! Now what must a customer do with a flippen broken TV that's not even 6 months old!!!!!!