Trying for 3 months to cancel, no luck!!!!

My one contract expired beginning March 2015 and I requested for the contract to be cancelled. I've received a response back eventually (**** customer service, don't even try to phone.....call will get disconnected) stating account needs to be current before they can activate the cancellation. I've done so and forwarded proof of payment which was sent to MTN requesting that they now cancel. It's almost a month ago and still no response as well as got another bill for the account this month. They obviously desperate in somehow forcing customers not to cancel because they losing all their customers. Shouldn't have retrenched all your staff MTN, your service is pathetic, non existent actually. Resolve this issue as a matter of urgency, ICASA complaint already logged!!!! MTN ***