You did not mention pre-soaking the rusted bolts. This is a common issue on older machinery. Did you use a penetrating oil for days ahead of your appointment??? Pre-soaking any rusted bolt/nut is just absolutely essential to prevent breakage. If the tech just took the rig in and twisted on dry rusted bolts without warning you then they ripped you off. No way can you just take apart 10 year plus rusted machinery dry.
This has been discussed many times here. For non-mechanical folks who don't read engine stuff here is what can happen.
I feel you pain, but it was somewhat preventable...sorry.