I do not get service / assistance

I have been trying, without success, to migrate my contract to a unlimited contract from May 2015.<br> <br> Every time I speak with a call center consultant I am told that my request has now been resolved, just to get to billing time and the problem has not been resolved. This cost me an additional R2500 - R3000 per month on my cell phone contract. <br> <br> If you phone MTN at *** you wait as long as 20 minutes from when they start playing the mtn music to you before someone answers your call, then weeks go by with no further assistance.<br> <br> I don't want to move to another service provider, I just want service.<br> <br>