Triple debit order amounts taken from account!

Onair has debited my account 3 times this month. After sending numerous mails to their billing department and trying to phone them plenty of times...I finally got through to a lady at customer services. Explained all to her and she assured me she has esculated the issue to the billing department and it normally takes 24 - 48 hours and the extra debit orders deducted will be refunded to me. I then get a mail from their billing department asking me to send them proof of the debit orders thats gone through 3 times. I was in shock! Now I have to go to the bank....pay for bank statements. Even downloading the statements will have charges to it...so I have to prove from my side their mistake! I rep**** and said they must sort it out from their side as its a mistake from their side and if they do not sort it out within 24h I will stop all debit order payments. Its been 24h and nothing from their side! I have no option but to stop all debit orders going forward! Nowhere in the contract it states that your debit order will go off 3 times at once! And if they want they can fetch their decoder as well.