$2200 I don't want to make you feel worse then Noahwins did, lol but how much did you buy your truck for again? The next time you drive by that garage who worked on your truck, drive it through their window and aim towards the owners desk.
Your truck is probably able to be corrected, but for god's sake you shouldn't drive it that way until it is repaired. Your best bet are speed shops if any are available that do fabrications. Best thing is to get a welder and proceed to do it yourself. We can help since there are a number of folks here that have all the experienced needed for this swap. Don't give up, your truck should be able to be repaired and the structural integrity corrected.

As for the shop, try reporting them to the BBB and take photos of the shotty work that was performed and the price you were charged. The BBB will work with you as well as try to get some or all your money back or even fix your truck the right way. Automotive shops have an oath to never allow a customer drive a vehicle that is unsafe for the road, yourself and by all means, other drivers. I would go after this shop for destroying your truck and don't blink an eye for it. This shop needs to be punished since they do not give a rats ass about safety.
Have another shop examine the work and get a written report on the work and safeness of allowing it to be driven away in that fashion.