Yes. You can be sued but from your statement it appears that you may have some defenses. You have two choices (1) not pay them and force them to sue you (2) sue them for a declaratory judgment in small claims court.
Pros of (1) a. they may go away b. you will not have to pay filing fee. c. you will not have to pay attorney fees
Cons of (1) a. your credit rating may be affected b. they may sue you in Court of Common Pleas making it more difficult for you.
Pros of (2) a. you pick your setting, Small Claims b. costs could be less c. you get it resolution faster d. you can prevent damage to your credit rating.
Cons of (2) you will have to pay out of pocket of filing fee and service of process and maybe attorney fee if you hire one.
I would go with (2) if you cannot work it out with them.
