I sign a contract with agas company which was bought out shouldn't their be a new contract for the new company

I'm not sure form what you've written what you question would be.  Many contracts have an automatic renewal provision that will allow for an older contract to be remewed unless one party says not to do so.  Even though the old contract is from 2008, if you are both complying with the terms of the contract, then perhaps it has such a provision.