MTN Service is pathetic

I recently opened (11 October 2020) an MTN Data Account and upon receiving the router and sim I noticed that my area coverage is extremely poor and I subsequently called MTN and requested that my contract be cancelled, They then confirmed telephonically that they had cancelled the account and said I needed to return the router to an MTN store of which I did all of this happened within the 7 days period that they said I could return the product if I was not happy. I was then requested to call back after 5 days after returning the router to confirm again that the contract had been cancelled. I called and every time I selected to speak with their so called service champions the prompts said I had selected an invalid selection. After having given up a few days later I received an invoice for R1240 for something that I did not have in my possession or had even used I then chose to send an email requesting that my contract be cancelled of which I received an automated response saying that the matter had been escalated. to date I have not received any confirmation that the account has been closed not even as much as an SMS or email. Their service is pathetic. I do not recommend that anyone sign up anything with them.