cancellation

I have been struggling to cancel my Telkom mobile contract since September after the contract has run its course. No response from the cancellation service desk. Call centre had me fill in new forms and email it. Still no response & my account is still being debited each month. The store has three case numbers already with my cancellation request. But even they cannot get through to the customer service desk. Latest case number which requests a refund as well. ***9. I have explained that I am hearing impaired cannot call but email only. This service truly is pathetic.