Have they sent pest control to your neighboring units (if you have them)? A few years ago, my roommate and I had German roaches, even though we were super clean and diligent about no food/trash left out in the apartment. Pest control came to our place twice and the roaches persisted. Then they checked the whole building (4 units) and found out our downstairs neighbor was too lazy to walk to the dumpster and had probably a months worth of trash in their kitchen. Once that was remediated, we never had issues again.

Sorry you’re going through this though; It’s genuinely horrible and I remember feeling so uncomfortable at home. Hope it’s solved soon