Legally, if you paid for services or treatments which you did not receive, you can sue for breach of contract to recover the unused portion of the money. Unfortunately, practically, there may be little or nothing you can do. If the business was a corporation ("inc.") or a limited liability company ("LLC"), then the owner(s) are not liable for business debts like this. That means that while you can sue the business itself, if it is out of business and no longer has assets or income, there's no way to collect, even if win; the owners can effectively simply walk away from business debts or obligations. On the other hand, if it was a sole proprietorship or a partnership or the like, then the owner(s) may still be liable on the debts, which means you could sue them personally as well as suing the business, greatly increasing your odds of a successful lawsuit.