Unresolved request to migrate to prepaid

I phoned MTN to request a prepaid to postpaid migration - but there was no answer. I then requested customer care (email) 8 days ago to move 3 accounts from Postpaid to prepaid - all three contract are out of contract Within a day I received a request to answer 5 security questions, which I promptly did And then nothing happened - I followed up twice and each time they asked me to answer the security questions (this is all by the same agent) For the last 3 days there has just been no response