Incorrect Debit Order Amount

It is with great disappointment I'm sending you this email. I downgraded my medical aid 30 June and confirmed that my new debit order will come off 1 August, only to find out you debited me the with the old amount !!!! When I called I was told you debit in arrears, but when I 1st joined it shows I was debited in advance?

I sent 3 emails and not 1 response.

Yours in total disappointment