Telekom continue to withdraw subscriptions from my account even after cancellation of subscription

I have cancelled my Telekom Mobile contract. The contract period had ended and I never had any service at all for months.

I cancelled online, I have the reference numbers proving the cancellation and yet they continue to withdraw the funds from my account.

I have spoken to other people who have had the same problem. It seems you cannot cancel a Telekom Mobile subscription for the simply continue to bill you after cancellation.