Account never closed in 3 years

On 2012-11-30 I closed my mobile account. The cancellation was followed up with a email 2 months later and I have proof where the cancellation of the account was escalated at least 3 times. But to this day I am still billed. One would think Telkom wold suspend an unpaid account after 20 no payments but they do not. The customer service line is hell as it takes 30 minutes or longer of holding on to be told the problem is being escalated. When you go to the walk in centers they tell me that they can not help as they do not deal with accounts Telkom owes me money for debit orders taken off my bank account after the close of the account but in stead Telkom now wants to hand me over for a bill of over R1000 take into consideration the monthly charge was R58.50.