I Have Drain Flies Or Bugs Coming Up My Drains Especially The Kitchen. Even The Pest Control Guy Cant Get Rid?

We’ve tried bleach and the pest control guy has been out twice to pour stuff down the drain. We had the septic tank pumped. I even bought foggers and put them under the house. They’re still all over my sinks, especially the kitchen sink.

Pest Control Do They Help You Figure Out Where Mice Are Coming From?

Or do they just set up traps? Traps are already set and 3 have been caught over 2 mths. I saw another mouse yesterday and have no idea where they are coming from. All the holes were patched up and they still are coming? The pest control my apt uses just set up traps. Should I arrange for a different pest control?