You're actually lucky most of it fell out. As other's have said, just go to a reputable shop and get it done right; do NOT go back to whoever did that to you. You're luck it didn't get infected.
As 2017 is ending soon I'll post a final pic of the progress we made on my dragon backpiece this year. First session was march 31st, 7 sessions overall with about 22 to 25h so far.
Probably won't be able to keep that pace up in 2018, but let's see how it will turn out...
Best wishes and happy new year to everyone