I would call the RV Dealer that did the work on the rig and ask what they recommend. Will they step up and pay for the cost of a locksmith to open and replace/repair the lock?
Be polite and professional.
If they refuse to do anything, then I guess you'll just be on the hook for hiring & paying the lock smith.
Your current situation is one of the reasons I like having a separate entry door by the driver on our rig. But in lieu of that, I'd leave one of the larger slider windows unlocked whenever you leave the rig, just in case this happens again. If this IS one of those Tri-Mark locks...it most likely WILL happen again. Though there was a guy on E-Bay that sold steel lock bolts to replace the pot-metal parts Tri-Mark used. I installed it on our lock the second time it broke, and haven't had a problem since. But I don't know if they would work on your lock.
Good Luck,
~Rick