Mtn sucks

Mtn billing me , suspending my contract after i paid. Mtn is robbing their customers . Im having a bad experience with mtn I've received an sms from mtn saying i need to pay R867.20 , i went to waterfront mtn they told me to ignore it coz i payed my cancellation fee which is r317 but if i get any problems i should come back to the store , and suddenly mtn suspended my phone , which i cannot use at all only by wifi. I went to Kenilworth Centre mtn I've explained to the consultant and she phoned the service provider and asked them why they bill me r869.20 they said for the early cancelation of an contract , then she told them but they told me the cancellation fee is r317 so where does the other amount come from if ive been told r317 . They couldn't help her and then she send a query and said she will come back to me that was 3 days ago but then today ive received a sms that mtn will take legal action if i dont pay the r867.20 which i refuse to pay coz ive already payed my cancellation fee which is r317 . I will give you all the reference number that will show the amount of the cancellation fee which would show r317. Reference no ********** 62/ ********** 58/ ********** 41/ ********** 13 Ticket no of mtn store query 35568 This is how many times I've contacted mtn for the amount for the cancellation fee and all of them it is r317 ! So who ever made wrong calculation should be paying that r867.20 coz i phone more then once, they get training to do their work properly , they cant suspend and take legal action against me for their workers fault. I pay my account every month didnt skip once but now i cant make phone calls , sms so watch the use having a contract phone if i cant use the data and stuff... This is starting to be frustrating coz i use my phone daily . Can you please help me? coz mtn cant help me! And if i owed them then why is that ********** 434 contract cancel? Then it qouldve atill been a contract sim then a prepaid sim? They couldnt answer that question as well ! Coz i know they only cancel the contract if you paid for it so how did they manage to cancel my contract if i still owe them??