Thanks, will do!!

Hi Wondering if you could offer any advice. My partner did not pay the water bill at a previous address when we split up I had to move. I phoned Welsh water and explained the situation in Sept 15. I agreed to pay the outstanding amount £400 by direct debit and set up one for my new property. I was not advised that this would show as a defaulted account. I have now paid off the balance and the account shows as closed on my experianreport BUT the last 12 months of payments that were made in line with the agreement are show as missed payments. I have queried this with Welsh water - their response was basically tough luck!! I previously had never defaulted on any payments with any company and had I been told at the time I would have paid the balance!! The lady from Welsh water was very nice and said I should have been told but there is nothing they can do about it now. Is there any way I can fight this as its killing my credit report!! Any help much appreciated!!