Dual employment

Hi All, I resigend my company "XYZ" on Oct 30th 2011, and i got NDF (No Due Form) stating that my last date will be on 30th Nov, and I worked till 4th Nov and then i left that company and joined new company "ABC". Since my new company "ABC" is not asking for revealing letter. I said to "XYZ" that i am facing some medical problem and can't report to office any more. And now my previous company "XYZ" got to know that i joined new company "ABC". Some amount got deposited in my account on 15th Nov and 29th Dec from my X-employer. Will this result me in dual employment. As i am not going to office from Nov 4th 2011. My previous employer sent a mail to my present employer about my case and my present employer called me and said don't take any tensions as we are ignoring that mail from your pervious employer. Will this effect me in loosing my present job? With Regards Vardhan