TELJOY POOR SERVICE

I am highly annoyed and disappointed with the service I've received from Teljoy. I bought a 55" Hisense Smart TV in 2016 on rent to own contract. I took ownership of the tv in 2019 and continued paying an extended warranty on the set to date. I wanted to start using my "SMART" tv a month ago only to find out it is actually a "dumb" tv and does not support Netflix or any other media app. I logged a service call on my extended warranty and a Hisense technician came out. He told me that not only is my Smart tv not a smart tv but that the warranty I've been paying is useless and a waste of money because the covered components have been discontinued. I've paid close on R30k for a now glorified computer screen on my wall. According to Teljoy my 5 year old tv is "too old" to exchange and I need to buy an upgrade to replace the tv that was sold to me as a Smart tv. This is seriously ridiculous. I need assistance to have this issue resolved asap.