Very Disappointed Customer

I've been with mtn for years had contracts through Nashua mobile which then moved over to mtn this is not the first time of the complaint where I have had no feedback from mtn as to why I am been continually billed a hardware fee on my account with no explaination I have upgraded from my s4 to the note 4 and I signed a contract to state new billing information at R529 per handset now my bill is over expected amount there was a credit passed on the account and now Gain this month we are billed the R398 on hardware AGAIN what the hell is going on with you people we call the call center hold on for 15 minutes we have wasted a lot of money calling through due to the 808 number never working... This matter is on going and is becoming very frustrating as a client for so many years.