WORSE SERVICE EVER

My LG 4 cellphone stopped working in September 2017 (the warranty is valid till Feb 2019, so it was relatively new) . I went to MTN, in Canal Walk, on the Sunday, to have it repaired or replace, and was told that I needed to have my charger along as well. I was then told, by the consultant, that if i took it to the service centre at Monteque Gardens, it would be done quicker, and that I did not need to take my charger along. When I got to Monteque Gardens, on the Tuesday, I was told that as they were taking stock I could only book my phone in on the coming Monday. On the Monday I had to go all the way back to have it booked in. (no replacement phone received, so now I was without a phone for the 2nd week) i HAVE BEEN CALLING EVERYDAY FOR THE PAST 2 WEEKS. First it took 4 days to be sent to Midrand. Then it had to be inspected, then it was decided that it would be replaced, but first the new handset had to be checked, to see that it worked?????. Then it was being couriered from Midrand back to Monteque Gardens. How long does it take to do so? I was told it would take 72 hours to Courier back to Cape Town. This was 3 days ago. I have asked to speak to a supervisor 2x. Each time no one bothered to answer, and after 5 minutes I was forced to cut the call. How come when you sign a contract you can receive a cellphone immediately? Or when you do so over the phone you receive the handset in 24 hours. Why is the after sales service soo poor????