So sorry to hear that you are still dealing with this problem.
If the broker is not providing you with information, it is time to get a real estate attorney involved to get this done. Yes you can cancel the deal, and since the buyers have removed all of the contingencies, you need only to request that they cloae. You can give them a deadline, and if they fail to perform, you can cancel the contract. I would strongly suggest that, if you do have to list your home again, you refrain from using the same brokerage again, since, as you mentioned in a previous question, the agent may have failed to provide you with adequate re Rae ration and advice in th sale of your home.
So talk to your broker and get the notices delivered to the buyers right away. Having to wait more than two months to close an escrow in a market such as we are experiencing today is unjustified.