You need to show up and get the bottom of it yourself.  Obviously, your former employer dropped the ball.  They may have hired someone to help resolve the matter, but it apparently didn't get finished.  One way to find out what did and did not happen is to go look at the court's file.  You can also pay a fee to get a copy of the file.  If your employer hired an attorney to resolve this matter, then there would be a notice of appearance which would contain a phone number of the attorney to contact.  If there are no notices in the file, then you need to start from square one and work out the best deal you can because it's not likely that your former employer is going to step back into the picture.  If you don't show up, it could result in additional charges or warrants being issued for your arrest.  If you are nervous about going on your own, hire a criminal defense attorney to help you through the process.