Worst possible service

my name is Neo Majeng i upgraded to my S7 over the call centre and it was shipped to me last year. now the battery on the phone is swollen and opening the back cover. i took my device to telkom kimberly on the 19th September 2017 and handed it over so that its taken to the repair centre and the end of the warranty on the 19th September also. i got notification that my phone has been allocated to the repair centre with ref TRL054346. i thought everything was sorted as i booked my phone in before the end of my warranty. then i get an sms saying my phone has been deemed out of warranty and i need to pay R4635.90 for the repair job. i booked my phone before the end of the warranty so its not my fault that you guys dont have a service centre nearby and that the phones need to be sent to johannesburg for repairs. this is **** service from telkom as this is the second time they refuse to reapir my phone just like the iphone 5s of my first contract. can someone please explain to me what the hell is going on as this means if i dont get any help i need to leave telkom because of this level of disrespect.