NEC 4 Option D Early Completion

The Contractor was completed the works 2 months earlier but the Client do not want to take over the plant. As a PM, what can I suggest to the Client and what should I do for this? there is no method in the Contract Data Part 1

@chriscorr @stevencevans interesting question any thoughts?

If the Contractor has fulfilled all his obligations in the Scope and has applied for completion, you have to award it.

As a PM you are not an agent of the client you are there to administer the contract.
Refusal to grant completion without grounds, is a breach of the contract and a compensation event.
Alternatively, you should change the Scope to include the Clients desire not to issue completion before the original contract completion date. You should also notify this change as a CE