Accounts in arrears

I have 3 accounts with Lewis and have set up a Debi check, they debit every month without failure and I have never missed any payment with them but in August I viewed my score and found out my account is in arrears, I called them and they told me about a now deal nonsense that I don't understand, something about crediting the wrong account. In September after I lodged this dispute all three aciunts were now showing 5 months in arrears.. How did that happen.. When you calm them they advise they will call you back and they never do they don't respond to emails at all.. Poor service.. After the September debit order the two accounts were updated but the other one is still showing arrears.. I am tired of calling them and emailing them, this has affected my score as it dropped with 10 points.. I wish to cancel all these accounts with them.. I do not advise anyone to take credit with this company...!!!!