Unauthorized Debits

I signed up with Dot Sure In October last year... Since then I have had nothing but problems. I Signed up that they debit my account for R 768.46 - However from November the amount of R 1176.09 was taken off my account, I had to reverse back the extra that was taken off. In December same story, however I am sitting in New Zealand at the moment and with the time difference it is difficult to get hold of banks in SA. Therefore I emailed Thina (Customer services Supervisor) whom I dealt with previously.... well no response was even received from her - nor my month paid back to me. AGAIN this month I have the same issue with Dot Sure debiting off more than I agreed to.