Telkom

I have cancelled my Wifi router (or ****le) in February 2020. I have waited for the contract to end; therefore no penalty fee. However, every month they still deduct R40 (I know it's not a lot, but still, I want to know why. Every month I call Telkom to stop the R40 debit order. Every month I've been informed that the situation is dealt with... but hey still no success. Thus, I've decided to stop the R40 debit order. However, now Telkom automatically deducted R350. Could you please clarify.