bad service on billing accounts

I changed my banking details on Jan 28 2016 and my bank finance dept send the Co that I have debit orders with them to change my debits from savings to cheque. All other companies did except finrite now I have to be having a problem I'm having now bcz I was being told that my banking details were changed in march and I have never made a payment this as the TM sad ' charnel ' worse I spoke with one of their hello peter response personal who deals with the problem whom I sent all the documentation to and last e mail I sent to she sad that they are still busy with. Worse now I'm being told to pay cash while one of the managers when I was looking for banking details in 04 Jan 2016 the manager sad to me we customers cab only pay via debit order only but now I'm being told to go pay cash five months later. Some one in finance did not do his or her job so why will I be reliable for it I will expose what they are I know from how they are handling there accounts.