If the contract has expired, then the 30-day notice provision would no longer be in effect, except *possibly* to the extent (if any) the terms of the contract specifically provide that the notice requirement survives expiration. Since the contract presumably does not say this--it would be nonsensical to require notice to terminate a contract which has already expired (and because it's nonsensical, a court might decline to enforce this term even if it was in the contract)--it is almost certainly the case that there are no grounds for requiring payment for termination without notice.