MTN Ignores Calls and Emails

I have been trying since the 7th May to migrate my MTN "made for me M" contract to prepaid. I have emailed Customer Care and the Retentions department numerous times but to avail. It doesn't help phoning MTN because you stay on hold forever. I even tried going to one of the stores but it was closed for deep cleaning. I want my phone on prepaid and I would like for someone to contact me and confirm that its done. My account was debited again and even though the amount is much less, I want to be on prepaid. I want the freedom to buy my own data and airtime and to not have my account debited each month. Thank you.