TXTAG Over billing Austtin Texas

I have filed a report 3 times with TXTAG and I have written to KVUE and I will continue to write to anyone until this is resolved. 

In late January 2015 I received a billed from TXTAG I pulled my information up online and paid my past due balance which was $214.37. I then logged back in and paid my current balance which was $81.78 and then I logged back in and put $40.00 on my account as I wanted to make sure that I had funds on my account so on January 31, 2015 I paid a total of $336.15. My account has remained in good standing where they continue to withdraw funds directly from my checking account.  

  I have now since receive bills for November and December when I pulled my account information in late January these should have been included in what I paid in late January.  I pulled my account information from there accounting system. This is an accounting error on their side.

When I brought this to there attention on their website I was informed that they would check into it.  Then I was informed to call them, which led to me being on the endless phone cycle which is never answered.  I have no problem paying my toll bill but when you are paying for something that I honestly feel like I paid no, I do not feel like I should have to pay it again.