I have had to remove a few of those. If you have a wet vac, you can fix it yourself.
1: Turn the power off
2: Remove the filter and remove the 2" pipe that the filter sits on. It unscrews counterclockwise like normal
3: Put the wet vac up to that hole and make sure it is sealed around the hole.
4: Turn the vacuum on and put your hand over the other hole in the filter box.
5: Give it about 15 seconds then turn the vac off. Open it up and the sock should be in your vacuum. If not, repeat a few times.