I just received a summons in the mail saying I'm being sued by Wells Fargo...?

Who is listed as the defendant on the summons? If you are not named, I wouldn't worry. Make a copy of the summons, write deceased on it next to your ex husband's name and mail it back. If you are named, is there a complaint annexed? If so, file an answer denying each and every allegation of the complaint; mail it to the plaintiff's attorney. If there is no complaint, write to plaintiff''s attorney and demand a complaint. Then deny the allegations. The worst thing you can do if your name is on the summons is ignore it. That way, the plaintiff can get a default judgment against you.