Telkom montly contract still not cancelled

I have requested a cancellation of my internet a month a go and the guy in the shop told me i need to fill out a form and it will take 20 business days , i have paid the month i waited for the cancellation Cause u have to pay for the month i lodged the cancellation still . I did all of this and now they are still taking the money off my account and it has been more than 20 working days// more than a month? .Telkom advertise their montly basis contract so openly but now i cant seem to get mine cancelled.