Double billing my account

When I signed my contract with Clientele legal, I instructed them to debit my account on the last day of the month, from day one they never did that. They kept doing this early debit order where they debit my account earlier then instructed. The new thing now they debit my account early and at the end of the month, so they double bill me, the latest one was on the 22 May 2015 thats and eary debit order and now yesterday the 28 May 2015 another debit for the same account. This is ********* behaviour at best and ******* at worst, clientele should reimburse me my monies as soon a possible, or I will report them to FSB and Consumer Protector. I will like this handle immediately, these companies advertise themselves as consumer friendly but the way they treat the customers, leaves little to be desires.