If the company fails to invoice the sales and the other party defaults on the payment, it can sue. According to the relevant public information, collect the evidence of payment arrears, bring a lawsuit to the court where the defendant is located or where the contract is performed, and apply for property preservation if necessary. Write an indictment, and then bring relevant evidence and the indictment to the court for filing and pay legal fees. Within seven days, those who meet the filing conditions shall go through the filing procedures. If it does not meet the conditions for filing a case, it will be ruled that it will not be accepted according to law. In this way, if the sales are not invoiced and the other party defaults on the payment, the company can sue.