Legal Question in Criminal Law in Texas

Either you wrote a check to the clinic on a closed account or you did not. You should go to the bank where you had the account (or try to do it via phone since you no longer live there) and ask to obtain a copy of the check or any records relevant to it.

If you wrote the check, then you are responsible for it. (I'm a little unclear on the situation because you seem to indicate that you had a debt with the clinic and were making payments on the debt, and that the debt was going to be for a lesser amount - but was this about the $1200 payment?)

Once you have checked with the bank either you will be able to get a copy of the check or you will not. If so, get the check and determine if you wrote it. Then, contact the DA's office from whom you got the letter again. If you wrote the check, you will have to pay it (and the fees) or you will get a warrant. If you feel that you had "replaced" that check with payments, you will probably have to go after the clinic in a civil suit.

If you did not write the check, let the DA's office know the problem. Also, whether you wrote the check or not, let them know about your efforts to contact the clinic and the status you were told. See what they say.

It is hard to answer this question because the next thing that you say or discuss depends on their responses.

Bottom line is that you will likely end up having to pay the check and fees, or you will deal with it in criminal court.