Settled account, now Edgars states i owe money

This is unacceptable and I will not pay another cent. I called your call centre last year March and spoke to ***ell who advised me on the total amount due to settle the account and that is what I paid. Please investigate and resolve urgently. Your calls are recorded and legally binding!! Please can I have contact details for someone competent at Edgars that I can deal. I cant believe that this is the only platform to communicate with you. Were I actually get a response after a few days.