If the company is a corporation of any kind, including a sub-S (or, for that matter, is an LLC), the owners (i.e. the shareholders) are not personally liable for any amounts owed to a customer  due to the company violating its obligations to the customer (e.g. taking their money, then not shipping them the product). That is the whole point of a corporation: to shield the owners from liability. The customer can sue the (insolvent or now dissolved company only).