I had a similar experience. Sounded like an India connection, looks like the number is a bookkeeping service in Philadelphia. The got off the phone to check with the tech and pulled up codes that said there were numerous issues syncing and that 43% of my files were corrupt. The list before they are non-retrievable is 49%. They wanted $1700 for a one time fix in 6-10 hours. For a fix and annual service to fix if it occurred again was $2300.  Then he offered a reduced fee from $1349 to $2250.  Problem is I let them into QB via Team Viewer. I changed my password and am set up to receive a code for authentication. But what did they get and what else should I do?