Poor administration and taking money out of account *******ly

I send an e-mail to Telkom 31 May 2017 with cancellation form. I send a follow up e-mail in June to see if they received my cancellation form since I have not heard anything. I received and invoice for July. Contacted them immediately. They asked me to forward the cancellation form again. They reimbursed me. I received another invoice end of Sept. Contact Telkom again. They asked me to send cancellation form again. Dineo Nkabinde send me an e-mail 5 Oct to say everything is cancelled. Received another invoice showing that they deducted money from account for Sept. Also received another e-mail yesterday for October. If my account is been cancelled, is it not *******ly to debit my bank account?