Incorrect Debit Order Amount

I have been having issues with Virgin Active since the first debit order. There has been several calls and they cannot correct there system. Last month they debited the correct amount for the first time and then month end August we back to square one. They call and advise I am in arrears yet they have been double debiting me since January. Therefore they now owe me money but no I am called by different people and they never read their system and notes that was loaded previously. Is Virgin Active a Mickey Mouse company now.