Can I vacate a Foreclosure Default Judgment for improper service? Can I file a motion to dismiss?

My bank, Wells Fargo, filed for foreclosure in early 2013, and I answered. At the end of 2013, the judge ruled striking my answer, and ordered the plaintiff to file an amended complaint, and proceed as an uncontested foreclosure. I didn't hear anything more until last month when they filed for Final Judgment. Apparently what happened is that they substituted a different attorney after my answer was stricken, and that attorney served me at the property address (ex-wife was living there at the time), instead of the mailing address I had filed in my original answer\CIS, and that the first attorney was communicating with me at. Also, If I was to look into an attorney at this point, would one take the case? If so, would it cost me an arm & a leg?