Bad service as usual

I always experience differently when requesting a contract cancelation with mtn. I sent a request to cancel a router month to month contract 14 Nov 2024 and sent the router to mtn at Carnival mall before 30days was over then called to follow up on cancelation and found out I'm owing R2000 for a router that they did not get. Yet when I called the store, they say the cancelation department said they could not cancel the contract. I then later got communication that it was fixed and got a reference number Tr something number. Now today I found out the contract was not canceled I am owing R5000 plus. It is very frustrating dealing with people who do not want to take ownership of anything and keep on sending you from one person to another and driving around costs petrol