Very Poor service despite a trouble free account of 30 years plus.

Please can someone help despite going directly to the Edgars store in Eastgate and having phoned 3 different call centres still unable to settle my Edgars account of 30 years plus. Charges, fees & interest continue to be billed and to date assistance from edgars staff has been totally lacking. There is never a manager to assist and I am desperate for a measure of service / help.