MTN is the worst!

I renewed my contract and got a Galaxy s6 Edge plus. Took it home and realised the phone does not receive calls when on LTE. I contacted Samsung and MTN. I then took the phone back and was given a new phone. The exact same thing happened. I was told that it was a LTE coverage issue. (My entire area is covered by LTE on the MTN coverage map). I called coverage and spoke to a lady by the name of Thupanis and when I told her that when tested at the shop the phone dropped from LTE to 3G to receive a call but would not do so at my home she blantantly told me, \NO! its impossible. She had spoken to the department and they said phones drop to 3G to receive calls. MINE DOES NOT. Ive tested it in excess of 50 times. I think the LTE in the Farrarmere area is to slow or to weak to kick that drop down process to 3G to receive calls. I called her again and she simply said "no it does\"" and wasnt willing to help me at all! Well done Mtn... Your network and the bad attitude of Thupanis in your coverage department has put the final nail in the casket. I will be cancelling 3 contracts between now and March next year! I encourage everybody to do the same!"""