If the court has not filed my DUI case within one year of the arrest, did the case fail meet statute of limitations?

So according to the DMV there are no records of me having a 3rd DUI in their system. The court does not have those records either. It’s been 2 years since I was arrested for this. The DMV said that all I need is an SR22 and I can get my license back. Unfortunately, I have enrolled in an 18-month DUI program that, according to the DMV, I do not need to be taking. Does that mean that there was most likely a clerical error and I lucked out and fell through the cracks? How can I get out of taking this class I’ve already signed up for?