Unauthorised Debits

I have an arrangement in place to settle the amount owing. I have had no joy in dealing with Wonga since March when i contacted them to make arrangements. I was eventually assisted by Frank who is the team leader for the customer care department, but his promises never materialise nor does he ever respond to my emails. I have to call into the call centre and be asked a million questions before being put through to him. My bank account is being debited by wonga every 3 days and i have to have these debits reversed which affects my credit score as well as my conduct with my bank. I also have to make time during the day to visit a branch to have this reversed which is really unnecessary at this point. During our last conversation Frank assured me that my account woukd not be debited in future other than the date that i have agreed on but once again my account was debited 3 days later. I have sent an email to customer care requesting these funds be refunded to me urgently but as usual [Email Removed] does not respond or even acknowledge receipt of my email.