Pause the contract.
Tell the freelancer:
I hope there wasn't any kind misunderstanding about the project. Whenever you work on this, please send me the files immediately. Please go ahead and send me everything you've done so far. Then I can unpause the contract so that you can continue the work."
Carefully review the files the freelancer sends you. If you feel like you are getting good value from this freelancer, that the amount you are paying is reasonable and you are impressed by the quality of the work... then unpause the contract and ask the freelancer to continue.
Otherwise, close the contract.