Tech support giving us the run around and not solving issue at hand

Same persistent issue of devices being kicked off or connecting and saying "connected without internet" whilst at the same time other devices have internet. Your support agents do not seem to understand the issue at hand and keep going around in circles with me. Is it so difficult to get a technician out to asses and sort a issue out? it has been months?

Last chance to sort it out or we will be moving service providers.