If you do not have a pest control company, this is something that you can do yourself.
Knowing where the nest is, you can spray it with the appropriate spray and kill off the occupants.
I prefer RAID Wasp and Hornet Killer. It will spray a distance of about 22 feet. The wasps won't even realize you are around until its too late.
They are most likely some species of wasps. Bees generally are not aggressive. I had unplanned hives of feral bees in my back yard for years and went among them daily without ever being stung. The same spray will, of course, kill bees if they are the problem.
Raid Wasp & Hornet Killer - Walmart.com