Unauthorised debit to my account

Dear Vodacom,<br> <br> I am positively shocked and disgusted that 5 months after I cancelled my services with you, due to appalling service for over 12 years, you think that you can debit my account with an imagined amount of money owing! You are NOT authorised to just take funds from my account after so long and you have NOT even contacted me regarding this alleged money outstanding! How dare you!!!!!<br> In the last month of service I confirmed multiple times what my last amount due would be, and I canceled the debit order at the same time. I paid you IN FULL that month and have never looked back, and received confirmation that the money was received.<br> <br> I insist on written confirmation that all of my details have been removed from your system and that I will never ever hear from you again!!!!!