Another Calls From Collection Agency

Yay, another call from some Collection Agency looking for my ex-manager. I guess he is still owing them a lot of money because this is not the first, second or even third time they called and asking for him.This time is actually the fifth or maybe the sixth time they called and looking for my ex-manager who had leave the company for more than 2 years! 2 years and yet they still call to his ex-company and not only that, I recalled that I did mentioned to them that he had not been working here in the same company for more than 2 years. Every time they will ask so many question and asking if I know where he is working right now or even if I have his address. Of course I did not give out his address when he is working in the company as it's consider as private and confidential, so I just asked those people who called from the collection agency to find their way for the address. There is no way I am giving out the address to them since they been giving me so much trouble and wasting my time answering the same questions again and again for few times.