Delay in contract processing

On 3 January I handed in all formal documentation to have my contract with MTN transferred to a prepaid configuration. At this stage I was informed it would take 3 days at the most to complete. I am doing this in order to move service providers to Vodacom, and do not wish to lose my number, hence this process. It is now 12 January and my contract has still not been converted despite follow up calls. The entire process is preventing me from moving over to Vodacom. The person assisting me at the branch is helpful, however it appears to be at the next level, the retention department, that there is a hold up. My monthly bundles have recharged again today, something I was trying to avoid in order to avoid an unnecessary billing for another month.