Virtual MAC ID Providers Needed - URGENT

We need Genuine Virtual MAC ID Providers - for Online Ad Posting Services.

Requirements:-
1. Different MAC Addresses mean Different Computer. And I need Virtual MAC ID ;
2. All the MAC Addresses should be Private & Secure ;
3. I need MAC IDs for Online Ad Posting Services so the Virtual MAC Addresses should be Secure.

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If you are Proxy Providers then Please Contact me through Mail Only ( Don't Send me PM here)!

G Mail ID: serviceproviderneeded (at) gmail (dot) com

MAC ID provider????
Is there any service like this available - in this Online World???
Anyone know about it????

anyone can help me by giving this info?
how to change my mac id of my laptop?

using software, search for mac address changer, like