Settled account, now Edgars states i owe money

Never before have I encountered such poor service. And from a big company like Edgars is even more disappointing. I have been a loyal customer for 15 years and kept my account in good stead. I called last year and got the total outstanding balance on my account. I settled my account. Now after more than a year I'm told 1 day out of the blue that I owe more. I have given proof of payment, I have spoken to numerous agents, supervisors and no one is able to assist. The supervisors are just as *********** as the call centre agents! Each time I'm contacted by a new agent who knows nothing about what was done or said on the previous call. Each time I have to repeat my story, each time I'm told they will investigate or get a supervisor to call me, but nothing happens. Everyone is so confused. The responses are shocking, no professionalism, no value is placed on GOOD customer service. Browsing through Edgars facebook page, it seems im not the only customer having this problem. Is this how Edgars plans on resolving their financial issues, by ******ing money from loyal customers? I logged a complaint 10 days ago and still no feedback, or how long it will take. Can Edgars sort this out ASAP