unhelpful and no service delivery at all!

I cancelled my MTN cellphone contract a month or two ago and decided to keep ny number as prepaid, since the contract has cancelled all my phone calls incoming and outgoing show as private number. I called 808 and was told by a gentleman I can no longer use that number as I am now Pay-As-You-Go and should callll 173, I tried and no where does it give me the option to speak to a consultant even when I pressed 0. So I call 808 again and spoke to Nompumelelo, I explained to her that I cannot get hold of a consultant on 173 and she told me to press 0, I explained to her that it doesn't work and none of the options are related to my query. She then told me that she was going to transfer me to a Pay-As-You-Go consultant and she just transferred me to the voice prompts again. Now seriously MTN, now that iv cancelled my contract does the service delivery end?? Should I cange networks because of the lack of service delivery??