When you requested a trial, they did not ASSIGN you a trial date at that time???? Or, did they give you a date, but you kept calling to try and confirm it?
Unfortunately, you are in a tough spot. If you had the money, you could hire an attorney to challenge this. Sadly, you don't. So, you will simply have to live with the hold on your license and the possibility that a local county warrant exists for your arrest. If you get arrested, and if you are charged with a misdemeanor for the FTA, then you might have the opportunity for court appointed counsel to help you out of this mess.