no service, cannot cancel

Been trying since march to try and port from contract to prepaid. My contract ENDED in April, I phoned 808 for weeks, hours and hours on hold. Eventually got a reference number and was told I would be contacted. No call from retentions yet. Went to an mtn store for the fourth time last week, informed them of the problem. Received a call assuring me that my ref/case had been escalated and can expect retentions to call. Still waiting MTN. in the meantime I'm still getting billed. You are now *****ing my money. I have not approved the continuation of my contract. I have done my part and have been trying for months to port to prepaid. You have made it impossible for me to end my contract, I have done nothing wrong, YOU HAVE! why is your system so inefficient and inept in order to end a contract. I feel the CPA should be really applicable here. You are trapping customers into extra payments they don't want because your system is a failure. Absolutely disgusted.