Yes i never knew about it or any suit
You need to vacate the judgement. It may not be possible, but you won't know until you try. The court where the judgment was obtained will have the forms, but having the forms and having the knowledge to identify what was wrong with the manner in which the judgment was obtained are two different things. If the amount is significat, you may want to hire an attorney.
You may wish to hire an attorney to make the motion. Shouldn't cost you more than $1500.