Vodacom debiting unfairly

I am being billed for a fibre line I cancelled because I was forced to move from my flat since the flat was sold to a new owner.

Sent my cancellation request on the 18th Jan. There's a 30 day notice period. Fine. So the payment at the beginning of Feb went off as expected. But the payment for March should NOT have gone through. I finally got my fibre line cancelled TODAY THE 12TH OF MARCH. So I am guessing my 30 days will still apply and another R700 will dissappear from my acxount at the end of this month! Why is Vodacoms incompetence always forced onto the customer?!??! UNACCEPTABLE. WILL NEVER SUBSCRIBE TO VODACOM AGAIN.