MTN-MONDO contract cancellation

I have been contacting MTN-Mondo regarding contract cancellation, i received call from one of MTN consultant offering me a contract sim with router in 2021 only to find out that the network coverage was bad. I requested to cancel at MTN branch Thohoyandou and they provided a settlement amount which I paid on the 11th of March 2022 amount of R2675 and sent proof of payment to *** as instructed. I have since been waiting for feedback from this department to confirm that the account is closed. I have also gone to the branch in Mall of Africa which they did not help at all. I also escalated this issue to the legal department in March and to my surprise, I still receive calls from the collectors. ALL I WANT IS TO CLOSE THIS ACCOUNT. REF ***