Terrible service from Telkom

My name is Anna Mthimkhulu, I had a cell phone contract with Telkom in 2015 and the contract expired in 2017 September. I mailed them the cancellation of contract document in July 2017 already and they said they didn't receive it as it normally takes 21 days to reflect, i mailed it again in August 2017 and by end of September they still said that they didn't receive. I mailed it again for the 3rd time , and they said they didn't receive it , up until this day they are still deducting some money from my account whenever they feel like it. I always reverse the money when ever they debit my account, last month they deducted R2296 and i reversed it. I am so disgusted by this nonsense Telkom. I dont know why they are still debiting my account 2 years later because by Sep 2017 , i was no longer using their services