Phone sent in a THIRD time for OVERHEATING

I have sent in my phone for repairs for a 3rd time in under 3 months and I am now out of warranty. I have received the worst possible service from Telkom and have paid for sim swaps and had to buy a new temporary device and change all my banking applications over 5 times now. Telkom does not seem to care at all. I still do not have the device which I pay over R500 a month for. SERVICE SUCKS!!! And I will not take back the same device!!!!!! My cell number is ***. I was given reference SM177947 from Kabelo at SOC, but on one seems to reply to emails or calls. PLEASE ASSIST