Unauthorised debit order deducted

After numerous calls from African bank updating my details that has not changed,i asked what I needed to do in order for them to not call me daily. The consultant said if I do a debit order they wont bug me. So I opted for this option but specifically said only to deduct as from end of October as I had already made payment. Guess what they still went ahead and deducted after I told them twice to only start from October. Im told the calls are recorded but whats the purpose of that if the consultant cant follow instructions. So in order for my money to be refunded I was to get a three month bank statement and it will only take 2-5 working days before I get refunded. Not happy at all. BAD BAD SERVICE ! You had no right to deduct from me after I instructed you not to. I WANT MY REFUND SOON!all documents was emailed as instructed.