a player by the name ***** has wrongly accused me of hacking and claims himself as a infinity ward employee and is stating that I will be banned from PS3 network. is this true that I will be banned even though I have not hacked before?
No. Activision employees have no power to ban PSN accounts, so even if he is an Infinity Ward employee, which is very unlikely, he can't actually do that. At best he could ban you from playing an Activision game online, and probably not even that. Sony doesn't suspend accounts unless a Sony employee can verify that a violation of the PSN terms of service or user agreement occurred. Sony doesn't believe anyone except its own employees. You can ignore people that threaten you with bans. The few people that actually have the power to ban you don't make threats about it. They just do it. Anyone that makes threats about it is probably lying.