MTN DOESNT TAKE CLIENTS SERIOUS

MTN Im sick and tired of you.I cancelled my contract 10 days ago,migrated to prepaid now you suspendend as service to make calls,why? everythig else is fine but i cant make calls,why suspend that service.In emergencies im suffering,i cancelled that contract when i had just got credited with minutes and sms so if i can port to vodacom ill loose the minutes that i paid 4.everyday i call and speak to 10 agents no help bla bla how can we brighten your day what a ****.I need to make what must i do.Its clear a serious bug in your system.IM SO TIRED I JUST CANCEL THIS ******* AND GET A BETTER NETWORK SIES