anyone know how to get rid of sewer flies?

Those are drain flies and the spray does nothing because the larvae live in the gunk inside the pipe, not in the air. Find which drain by sticking a bit of tape sticky-side-down over each one overnight - the one with flies stuck to it is your source. Then scrub the inside of that pipe with a stiff bottle brush as far down as you can reach, pour boiling water, and repeat most days for a week. Bleach just runs past the film. Enzyme drain gel helps where the brush can't reach. Once the biofilm is gone they have nowhere to breed and they're gone in a week or two.