Contract termination

Mtn is a bunch of ****** and I am sick and tired of calling the call centre. I have been trying to migrate my expired contract phone for almost 2 months now. after receiving an sms informing me that my contract phone has expired i called the call centre and informed the consultant that i do not wish to do any upgrades, i want my phone to be migrated to pre-paid I was informed that i will be receiving a call in 5 working days to process my request. i waited 10 days still no call. i then called in again but still told to wait for a call. i sent an email with my request and received an email from you guys trying to RETAIN ME!!!. i called in again but told to WAIT. AT THE END OF THE MONTH I RECEIVED DATA AND AIRTIME i called in again and i was informed not to use it and money wont be debited. to my surprise MTN debited me!!!!!. I DO NOT WANT ANYTHING TO DO WITH MTN CAN SOMEONE PLEASE MIGRATE MY SIM CARD TO PREPAID...