A few years ago I rented out an apartment for a year with two room-mates who eventually turned out to be unreliable. Luckily, I had the foresight to only put the electric bill in my name under a 6 month plan. I found a replacement room-mate around month 6, apologized to the landlord, and moved out after one of the room-mates started messing around with heroin to an alarming degree. Take note I warned this dude of the heroin usage and he didn't care so this is not an issue of karma.
About three years later now I check my credit score and see it has been dinged by a collection agency for a debt owed to said electric company. I find out that the company continued to use my name in the account, and then towards the end (months 10-12) whoever was using this account stopped making payments.
I have proof that the contract was 6 months long (their records indicate as much, too) and I have retained an email correspondence (using the company's service request database) between myself and an employee where I said in no uncertain terms I would not renew. For those 6 months, all of the bills were paid. A Lannister pays off his debt, etc, etc. The employee provided a phone number which I know for a fact I called to ensure there were no loopholes. I even wrote down in a journal some brief notes about the conversation.
They also applied my security deposit to this account, but it was only a drop in the bucket. Apparently I owe $2,000 for electricity I never used. I have told them in addition to sorting out this mess that I want my security money back in full or I would file a complaint with the PUC and sue. They are a regional electrical company, not national. What are your opinions on how I should proceed?