Troy Capital LLC, Assignee of Repossess Auto Sales Suing me for an account that was written/charged off Los Angeles California

I was served with a summons to appear, in court, for a vehicle that was financed by another company, that closed my account back in July of 2014. The original finance company, sold my loan to another company that wrote off the vehicle as a loss and now this  company Troy Capital LLC thinks that they are going to pull a fast one and try to recover money for a vehicle that has already been charged off.  I could contact the IRS to see when this tax write off actually occured to speed things up, but I am supposing that they really think that a judge is going to rule in their favor when he/she see's all of the quite confusing, but not too confusing for me, documentation that was supplied  when I was served.