Customer service is bad!

So I have been with Lewis for some time now and have been making payments on a regular basis because of the debit order that I have in place. However due to *****ulent activity I had to change my banking details in January this. I then when to lewis store in town center to advise that I have to update my banking details because the details they do have the account has been closed down. The agent that assisted at the time advised and assured me that the debbit order is still active and that payment will be successful. I then went back and forth with the advisor telling him that I had to close down the bank account and have to update the details. I was then told there is no need for that because it is still active on their end. I have been receiving text regarding loan options but I am being told that I cannot get the loan because my account is in arrears. I the left and I am now being told that the goods will be collected due to none payment. This has been the worse and stressful. Because now I am being held liable for a missed payment in which I took the responsibility to have the details updated but was assured by an advisor that the payment will still go through. They are refusing to assist with the loan option even though I have asked them once again taking responsibility to the deduct the amount in arrears from the loan I am applying for. JUST WOW!!! I AM LOOKING FORWARD TO SEE THEIR WAY FORWARD REGARDING THIS AS I DONT THINK OR FEEL THAT I SHOULD BE HELD LIABLE FOR AN AGENT WHO MISADVISED ME.