Now there are new policies 13, 14, 15, and those who return to China can get multiple-entry visas and C-3 visas for 1 year.
This visa can stay for 90 days at a time and for another 90 days when you come back. Valid for one year.
The visa handled by the agency you mentioned is illegal.
There is no visa fee of 6000 yuan at all. There was only one lottery in September this year. If you are drawn, they will get 6000 yuan for nothing.
You should have done the right thing. Very wise. Waiting for the draw in September.
Or found illegal, not recommended.