Appauling Service

I have been a client of Teljoy for the past 15 years. I have paid off many items and currently paying off 4 items. Never once has Teljoy struggled to get their instalment from me. I have a TV which I have paid off and have taken out maintenance plan on, has gone in again for repairs. My issue is that this TV has been repaired 3 times. Once for motherboard melting (in the first year) and now twice for the power supply. (2 consecutive years). When I first reported the fault to Teljoy the report was never logged. I had to repeately phone back to get a call logged. The TV was collected. Then for the next month I had Teljoy and Barndards call me to collect the TV. Then out the blue I had the driver at my door to deliver the fixed TV without prior arrangements. I requested Teljoy to send me the technical report. I had a phone call and I was told that replacing the exact same part they replaced the year before. I asked if someone from customer care can call me so that we can discuss this as I think its unacceptable that I have paid off for a faulty TV. Two days ago I get an email stating a clause in the Teljoy contract stating Teljoy is giving my TV back in working condition, no phone call no apology for the terrible service. Just an email. My question is how can Teljoy sell a defective device to a client. And today once again I have phoned and asked if someone from customer care can actually give me a call to discuss this. I find this very unprofessional and Teljoy going against all contractual obligations to me as a long standing client