Contract to prepaid migration

I called MTN on the 21/09/2015 letting them know that i will not be renewing my contract which was due to end on 25/10/2015, but would like to be migrated to prepaid. On realization that, this was not done on the 25/10/2015, I again called MTN on the 26/10/2015 and asked them to migrate me. I was told I should wait a further 48hrs. On the 28 and 29 Oct, I called I again I was told to wait another 48hrs.<br> <br> I have given MTN more that enough time to migrate me but they are not willing....What else I should? <br> <br> <br>