Very POOR SERVICE from TELKOM

Good day I have a concern with the way Telkom handles it clients regarding cellphone contracts. I have taken a second contract with them on the 21th April 2018, it took 3 days to activate the new contract. A day later the cellphone started to heat up so we took it back to the store. The phone was booked for repairs although it was still within the 7 days policy . To date I have received no communication regarding the phone which is a month later. We lost one month of data that was supposed to be used to update this phone. I've been to another Telkom store and they give me the same story that its out of there hands. They themselves do not know where the phone go to and the store takes no liability. Today is the 23.05.2018 and still not response from Telkom about the handset. What do I do...