Do you have a file stamped copy of the general denial answer you filed. if so you are safe. Just file the copy with the court. The court's recognize the imaging system is faulty. It's your responsibility to have a copy of the file stamped copy in your possession.
The custodial parent can only go back to the last court order to ask for child support.
The issue regarding while you had custody is irrelevant. You had the opportunity to ask for child support and you did not ask. It's a moot point now.
If the child is over the age of 18 and out of high school, this case is moot. You don't state how old the child is. The child is out of high school so one of the grounds of support has occurred.
Get the case out of TX A G court. I'd want to be back in District Family Court.
I'd hire an attorney pronto.
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If Temporary Orders are all that were entered, file a Motion to Reconsider (or Reopen, if that is how the local clerk referred to it). Get it set for hearing. Explain to the OAG and the judge what you told us. Since it was Temporary Orders, the court can simply "undo" it.
It sounds like the dispute is over seven months of support (December 2012 - June 2013). There is no question you would be better off with an attorney. It is your decision whether you are better off spending that money to get out of owing that money. Remember, owing past due child support has a lot of negative ramifications.