MTN customer service is the worst

I have been in communication with MTN customer service since April to cancel my old subscription and migrate my number to a sim only deal. On 10th May, I received confirmation that my number has been migrated to prepaid and given 2 options. I confirmed the sim only deal.

Since then, I am still being charged for my old subscription! I have sent numerous emails to both customer services and retention department, with reference to previous emails. However, each time I am asked to confirm my details since it's a new agent. There's simply no continuity and followup.

MTN has just charged me for a 3rd month after confirming my migration back in May. Today, another (new) agent has asked me for my details. I have given the same details for the umpteenth time BUT I'm sure it's going to be another mess.

Useless agents, no supervisors, empty promises...MTN customer services is the worst I've ever experienced.