This isn't good. Purchase & sale contracts generally have dates on them that you need to keep. If you had a closing scheduled for last week, the lender would know this and should be advising you so you can request an extension or provide whatever they may be lacking.
At this point, I don't know what you've tried to do to communicate with the lender but it's time to up your game. If they don't return your email, call them. If they wont' take your call, visit them. If they won't see you request the owner/broker/manager. You deserve answers.
Where is your agent in this process? They should be anxious to get your deal complete too. Perhaps if you double team them you'll get an update. I would also want to find out from your agent the status of the contract. If you were to close last week, you will need an extension signed by the seller agreeing to it.