@sajedulshawon1 gave a great response for a seller wanting to extend the delivery time, I think, but you’re a buyer I take it?
Your seller has broken the ToS by delivering work which wasn’t complete. What you can do if you want to is to ask for a modification to the order so that your seller gets a chance to redeliver. On the other hand, if you don’t want to wait, you can cancel the order as the seller failed to deliver what you ordered - it’s entirely up to you. Your seller should have asked for a time extension before he/she delivered something which he/she knew wasn’t complete.