Sadly, I have seen a LARGE number of others that have gone through this exact same thing.
QB never has any answers as to why they have closed merchant accts. They jus t do it. Then, they hold the money for a s long as the possibly, legally can, just to turn it over to the state of their customer.
You can find others in this same boat by using the Search bar at the top of any page.
I really hope you follow through with the lawsuit. Intuit/ QB needs to learn that they can't keep treating their customers this way. It's criminal!!
Good luck.