This happened to me once on my old gsxr400. I was on the way home from work when the bike felt like it had no power.
I pulled the clutch in and the rear started to lift so I dropped a gear and did the longest burnout ever!!
That was scary because I didn't know what was happening. Luckily the breaks werent good enough to completely lock the front. But when I stopped they were smoking so bad.
I hope the garage accept liability and fix your bike to better than before.
Oh, and welcome
