Line not migrating from Contract to Prepaid

On Tuesday 08 Dec 2015 I received an SMS from MTN saying that my number had been migrated from Contract to Prepaid. I spoke to a lady in the Retention Department who confirmed that I was on prepaid. (I am not able to make calls from my phone since the migration - I can receive and send SMS messages though). I called back to ask why I cannot make calls and I was asked to wait 2 to 24 hours, which I did - I called again this afternoon and I was asked to wait another 24 hours. Please can someone find out why this is taking so long? (Note: My cell number is the same as captured in the complaint)