bad service, ****ty devices

i opened a new contract with cell c for the A53 3 months ago and now the device is not working. The device was working perfectly fine, no water damage or cracked screen. The device randomly overheated a couple of days ago and hasn't been working since. this is very disappointing considering that i've only had the device for less than 4 months now, called an agent to query about warranty and was told that i would be charged for repairs even though i've only had the device for a couple of months. This is ridiculous and bad service as there was nothing wrong with the device prior to the overheating and i've only had the device for less than 4 months. The simcard i received with the device is also no longer working even though its never been taken out of the cellphone and i was told i need to purchase a new one