A motion for summary judgment asks a court to do just that - grant summary judgment for the reasons outlined in the motion. You get to answer the motion, and you get to argue in court that the motion should not be granted. Whether or not you have any valid defenses isn't something I can answer for you - we don't have access to the court file, don't know the full facts, and as of yet their motion doesn't even exist in written form so we can't review it.

You can file an appeal from summary disposition, but again you need to have facts or law supporting your case if you wish to prevail.