Pathetic service from TELKOM

My contract came to an end at the end of February 2020. I cancelled my account on the first of February 2020. All payments were up to date. Now, since April 2020 they keep on taking money out of my acc. It is not an active account so every time the put a debit order through and it bounce, it is costing me R120. The last time (end July 2020) the tried to debit my account with double the amount. R120 again!! There is no intellectual human that one can talk to. Why must I go and stand in a line for a few hours to sort out their problems created by *********** staff?? Nobody reacts on all my emails yet I get sms's telling me that If I do not pay, I will get blacklisted. I am fed up with them!!!