im taking a former customer to court for an unpaid bill. the customer claims they gave a former employee of mine cash at the time of each mow (4 times). the employee who serviced that account never turned any money over to me or said anything about it. after dropping the client for unpaid bill for the month, the employee disappeared. could this be an excuse from client? did he really give employee cash and employee steal it? is client still responsible to pay me for the month? or am i at fault for hiring a possible thief?