I don't know much about this subject, and hesitated to post up. I assume you called an exterminator. I guess you could call your local health department. They can give you direction. Also, a county extension agency might have some thoughts, too. Sure wouldn't hurt to try.
The fact they are breeding and surviving in your home makes you wonder. You have probably pulled all the furnature, including the refr., away from the walls and checked things out? Thought about that new sofa you bought so cheap from Mexico? Minus all that, doesn't leave much to make deductions, does it?