Complaint against Mtn

I have a 2 year contract with Mtn for wi-fi which expired on the 3rd October 2020. On the 1st of September 2020 I emailed a form to them which I received from them stating that I want to migrate to pay as you go. They also requested my i.d. which I sent. On the 12th October 2020 they put the data onto the wi-fi router again. I sent an email to the person I sent the form to, and asked what was going on. I also tried to contact the retentions department, to no avail. I managed to speak to someone who took all my personal details and gave me the following reference number ***. I also sent an email to customer care. Customer care rep**** and said they would contact me shortly. The other person I sent the form to migrate to, told me that they could not cancel my contract. All this is totally unacceptable. The contract expired on the 03/10/2020. I sent in my request on the 1st September 2020. which was more than a month's notice. My wi-fi number is ***. Please can you help me to get this contract cancelled. Regards. Veronica Fourie