Cannot get them to actvivate my LTE on my phone

Since getting my LTE sim card I am having problems with my reception and my phone cannot connect to the LTE network. My wife (S5) connects to the 4G/LTE band sitting next to me is the same room / vehicle but my phone (IPhone 6) showing only 3G but the speed is terrible and I cannot believe it is even GPRS. It is not possible to get thru to 808 as they just don't pick up their phones and I have therefore decided to go to the MTN shop. The lady said that it is a Node2Node problem which I cannot believe as it is not the area but rather the Sim card according to my knowledge.<br> I am paying a lot of money monthly on 2 contracts and getting only EDGE on my phone most of the time.<br> <br> Unfortunately I have recently upgraded and is now stuck with this bad service provided for the next 20 months. Please people, don't sign with MTN, rather go to Vodacom to get value for money.<br> <br> Even my friends with Cell C contracts are getting better downloads on their phones than what I can dream of. No to MTN<br> <br>