continue to debit my account after cancellation

i originally cancelled my contract in July 2015, i was 6 months into a month to month contract after 24. up until January 2016 you still debit my account. i have sent through a cancellation form 3 times at the offices and via the net. december i receive a call stating my account is finally closed only to see january you have taken again over R700. i have had it with telkom now and currently taken legal action. i have logged complaints on the facebook page and receive replies and no one ever calls for months on end.