Cancelled contract to go Prepaid and now can't receive or make calls

I cancelled my MTN contract on Friday Morning (7th of August), to rather go prepaid instead. The guy on the phone assured me that the process would be seamless and that I would be up and running the same day. The next day, I was unable to make a call or receive a call and get the message "The number you have dialed is incorrect, please check the number and dial again". I went to the MTN store in Cape Gate that same day, and the guy in the store logged a ticket with support and rica the number again. He said that it should resolve itself with in 24hrs. On Monday, 48hrs, it still had not been resolved and I went to the store in Tyger Valley. The lady that assisted me logged a ticket with technicians as she said she had seen this before and they needed to do something on their end and that it should be resolved within 24hrs. Still not working and can't bare another visit to an MTN store to be told the same thing. Longest 24hrs ever!!!!