MTN’s Terrible customer service!

I recently took out a new contract with MTN. After using my phone for 1 and half days the screen went blank. I returned the phone the next day knowing about the 7 day I get for out of box failure. I was assured I would hear from them in about 3 days once my phone has been collected. 3 days later I received a call from the sales lady and she told my phone was rejected and that they say I must of dropped it, which I never did. They told me they will now send my phone off to another department, warranty department and now I have to wait another 4 days to hear what will happen. When I visited the Mtn branch to speak to a manager he had a completely different story and told me my phone was sent to the incorrect department and the sales lady told me she NEVER told me my phone had been rejected because I had apparently dropped it. I have not even had this contract for a few days and a device for less than 2 days but had absolutely terrible service from MTN. I was told I would receive 30gbs of data which was advertised, I have still not received it.