Cancel contract and downgrade no to prepaid immediately

I have called MTN numerous times inorder to cancel contract and port number to prepaid. I have been promised a call back on all these occasions but nothing until today. MTN has been nothing but a nightmare to deal with. On the last occassion i was told about the number not being on the new system blah blah.....can i urgently port number to prepaid *** Mr Gcali being my ill father. Kindly call me on ***