Take your citation to the appropriate court and ask the clerk to put you on calendar. If resolved, you will pay the correction fee and dismissal with be granted. The DMV will be notified by the court. DO NOT WASTE TIME. DO IT TOMORROW. I DO NOT UNDERSTAND A SIX MONTH DELAY IN AN ARRAIGNMENT.
This can be dealt with. You have some proof- do not lose it. Get a date from court clerk or get an attorney to deal with this.
This case will need to be put on calendar to be heard by the traffic commissioner.
I would recommend hiring an attorney to do so - it will likely save you an enormous amount of time and stress, and be significantly cheaper than the $900 fee due.