AUSTIN – The Texas Department of Transportation is providing an explanation for some of the problems surrounding the recent surge in reports of incorrect TxTag bills.

TxTag said in a statement on its website that efforts to get toll tags to work with other states are to blame. During the process, many people got pay by mail invoice bills, because of a delay transferring that information across state borders.

When KVUE reached out to TxDOT Wednesday, officials gave more explanation as to why customers are seeing more billing issues lately.

Legislation passed in 2012 called MAP-21, or "Moving Ahead for Progress in the 21st Century," makes state tolling agencies that receive federal money sync up their billing systems with each other. It was during the process of synchronizing Texas' systems -- Austin, Dallas and Houston -- with the Kansas Turnpike Authority (KTA) that a data transfer error happened.

"In early May 2017, TxTag along with other toll authorities within the state made the transition to include Kansas Turnpike Authority data, which ultimately caused an error in the transfer of data files and resulted in errors on some customer accounts," said Mark Cross, a TxDOT spokesperson.

TxDOT does not know how many accounts were affected. To resolve your billing issues, call TxTag Customer Service Center at 1-888-468-9824 toll-free.

TxTag also said people are having to wait a long time when they call to fix the issue due to the amount of people impacted by the error. TxTag recommends people call the agency of their respective marker to dispute the incorrect invoice.