For over a year now I have tried to get someone in your billing department to contact me and resolve a balance due that has appeared on our billing invoice. I have sent registered letters and someone did call and I gave them copies of the research I did but it has still not been cleared up. When I pay the bill I put in a note asking someone to contact me but they do not. I am paying the invoice short each month leaving the previous balance and $5.00 late payment charge off. I still have my backup for the original overcharge where we did not get a check credited to our account.