MTN not allocating my minutes and data since upgrade

I am really disappointed in MTN. I have upgraded my contract with them in February but still now in April I have not received my Anytime minutes or Data. They keep saying they have escalated the matter but no one gets back to me. For such a big multi-national cellular operator they are very unprofessional. All my payments are up to date but they still not allocating what is owed to me. i will not be paying anything anymore until they fix what is broken. I am really disappointed with their service. DO NOT USE MTN SERVICES. GO TO VODACOM.