Poor customer service

Good day. I recently cancelled my daughter's contract which I had been paying. I received a cancellation confirmation and told the operator I want the cell number to be converted to prepaid. This contract expired in early March and up until now I can't access this sim number. It now says this number is not an MTN number. I contacted the call centre on several occasions without any success. I then sent them an email and received a reference number that a consultant would contact me. Till now no response after three emails . This is extremely poor service and I will definitely not recommend this service provider to anyone. My reference no. 292726. Regards Colin ********** 244