463148 Looking for a PHP/Mysql and Oscommerce Security expert

Hi, I am after a security expert. We occasionally get spammers attacking our dedicated server sometimes and then we have to get rid of them every time. I want someone who can assist in patching up our Mysql/PHP/Oscommerce and ensure our server is foolproof and perfectly secured and no one should be able to easily hack into server again for any purpose. All bad scripts or dirty files should be removed. No one should be able to get into for spamming purposes anymore. I understand that nothing is 100% secure but at least we make server perfectly secured enough to get rid of 99% of problems at least. If server is attacked again then You will have to refund my money as I am not looking for a newbie. I am only after an expert who can give some evidence/proof of their capability before taking this project with full responsibility. Thanks itsurfers