Account double billed, no response by mail/email

I have informed ADT to change the date of my debit order in December 2014 from 28th to 1st: they did not do this and debited me incorrectly in Jan - I called and confirmed the change but the same thing happened in February.<br> I also changed my banking details from ABSA to FNB and informed them of this during February. At the end of February, they debited me on the 28th from my ABSA account and debited me on the 1st from my FNB account!<br> I have called and mailed, spent more that 40 minutes on the telephone but as yet my problem is not solved. The supervisor is not available and the accounts person did not switch on his phone! I have been on twitter and emailed but no response to date. <br> SO ADT has double billed me and I can do nothing about it!