really?  Weird.
What companies are they?
Even when I turn down somebody, I keep getting calls. For the last 8-10 years, I have suffered from vertigo/memory/processing issues and have told my contract shops that they do NOT want me since I was not capable of learning new APIs (as in local APIs). 
Yet, I am still called at least 2x a week and get emails daily and asking how I am doing and can I return to doing kernel work/API design. 

I will say, to be fair, a couple are now from Indian companies. Whatever you do, do NOT go to work with them. HORRIBLE COMPANIES. And while the Indians that are here are pretty darn good, the ones overseas STINK. If the CEOs understood what was really going on with Indian coders, they would fire any CIO that tries to outsource.