Failure too communicate

I have 2 contracts with MTN a data contract and a cellphone contract my data contract expired no one from mtn or there services contact me prior to offer a upgrade or to explain to me that the full amount will be billed to me to my surprise in a MTN store instead of paying my usual amount that i was billed i had to pay 3 times the amount very angry as a paying customer for all these years i payed the full amount that was requested which is 1824 rand and i immediately requested for a cancelation on the contact that expire which was my data sim so now i have the documents from mtn stating that a cancelation process is in progress which are 3 steps 1-cancelation requested 2request sent to retentions and 3 retentions contacts customers on my form it is satated that the progress of my cancelation is on option 2 this was on the 05-09-2022 i went today on the 10-10-2022 too pay my cellphone bill not knowing that my data sim has not been canceled and again mtn requested i pay the full amount again which is 1824 rand and i was shown that a request to cancel the data sim was sent but nothing absolutely nothing was done about that request so now my cellphone numbers are barred i cant use my phone nothing at all because some 1 at mtn was *********** to do a simple cancelation on my contract so i want mtn to either pay me my money back or cancel it correctly because as a customer i wont pay for somebody elses mistakes ill be waiting eagerly on mtn responses because this is completely unfare to all customers to expect us to pay over and over for mtn mistakes this is really bad and *********** service i expect to have this issue sorted as fast as possible i use my phone for business, income lost will be billed to mtn