Yep, happened with me too.
I remember my wife being adamant about a fixed rate mortgage while the banker was being super pushy about doing a 5 year arm. About a month after we got our house, we started getting the letters, "Your loan was sold to Bank XYZ, your new loan holder is ABC company." Literally every month our loan was getting sold multiple times.
Then Wells Fargo started calling about re-financing our mortgage around late 2006. We were like, "Huh? We're on a fixed rate." and the guy was like, "Says here your 5-year ARM you signed is expiring in 2008 and your rate is going to go way up."
Alarm bells started going off. We made an appointment to sit down with the guy at Wells Fargo. Sure as shit, the guy who was pushing us to do a 5 year ARM falsified our loan papers. Inflated a bunch of our assets to get us qualified for a bigger loan that we didn't need. He put us into a 5 year adjustable rate that was set to increase wildly in 2008. We refinanced and got our mortgage into a fixed rate again. We talked to an attorney about suing them, but by then the crisis was starting to gain some real steam and the company who did our original loan had already been out of business for six months.