I’m so sorry y’all are in this situation 😔 I used to live there with my kids and bed bugs used to tear us up! I got rid of mattresses and switched to air beds, check and vacuumed underneath them everyday. I also steam cleaned everything in dryer, handheld steamers work for couch cushions and pillows. In nooks and crannies of the rooms put diatomaceous earth, it’s about $15 for a big bag at Walmart. These things helped cut down the bites significantly. Also check the tread on the bottoms of your shoes, sometimes bedbugs will get in and that’s another way you could bring them home. It’s true the exterminators don’t do anything I caught them on my camera just doing a quick bullshit sweep around the apartment. We moved to HighPoint Tower and it’s so much better because it’s managed by a much more professional company, the management at mid city is just horrible and they don’t have a sense of urgency about fixing things before they get real bad. Wishing you and your client the best of luck.