That's all an educated guess on my part, having dealt with a bit of a similar scenario, but I am NOT AN ATTORNEY AND SO CAN'T GIVE LEGAL ADVICE. You really should speak with your buyer's agent and your real estate attorney about this matter, and perhaps do another contract extension so all parties are covered. Good luck and kudos for hanging in there!
I'm not sure what time frame you're dealing with here, but get your agent on the case right now, have them talk to your lender too, or you talk to them, and find out where things stand from both sides. Having these issues to deal with is not uncommon in the situation you describe, but not knowing, or not having your agent trying to get answers and communicating with you, daily, if that's what you need, is unacceptable! good luck!
Are you dealing with a buyers agent to represent you or directly with the banks real estate agent?
I am assuming that you signed a Purchse and Sales agreement . Have your attorney review it and advise you on this.