He also clarified to me that the contacts that he refered me to, were his personal contacts, at the time he was working for my competitor he did a couple of trades with them, but he doesn't think they continue to deal his ex employer.
Also in regards to his friend that still works for his ex employer, he clarified as well, that the contacts he could provied me with, were companies that use to be his friend's clients but that for diferent reasons they no longer deal with the company he works for.
Please let me know if in light of this clarifications I could use such contacts.
Thank you
A. Horav Shlomo Miller's Shlit"a opinion is that once the client has voluntarily ceased to do business with the competing former company, you can engage him as a client for your benefit, as this is the common way of doing business.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit"a