Bad service

In December i took out a data only contract by mtn and i was told that i will be able to do data share once i active the service. the service was activate but i kept on getting error messages when trying to do data share. i looked the query with mtn on the 16th of December. Every week i follow up with them just to be told that my query has been redirected or get other excuses. After being redirected 3 times, after two week i call again just to be told that my query was logged to the wrong department it will be sorted in a week. this after i have already received 3 sms from them saying it was resolve. On the 14th of January I call again to follow up just to be given feedback by them that they don't know why i get these error msg. The one lady even seed that I couldn't do data share with the number I’m trying to share with because it’s not my own sim-card and the sim card was not active, this after I when to go buy a prepaid sim card which is registered on my name. This was after i already told them that i have tried numerous mtn numbers as it shows you can do data share to anyone but I’m still unable to do it.. I am very disappointed because i was told that i will be able to do data share but up until now after calling all this time, Im still unable to do anything and it doesn't seem as if the problem will be sorted out by mtn because I keep on getting lame excuses.