After the deadline, I sent a text message saying that I was sued.

Legal analysis: this situation belongs to the prior notification procedure. If the other party finds that you have not provided substantive treatment methods, it will sue to the court to recover the arrears. So the court will send you a notice or subpoena to appear in court.

Legal Basis: Provisions of the Supreme People's Court on Several Issues Concerning the Application of Laws in the Trial of Private Lending Cases Article 2 When a lender files a lawsuit in a people's court, it shall provide debt certificates such as IOUs, receipts and IOUs, as well as other evidence that can prove the existence of legal relationship between lending and borrowing. If the creditor's rights certificate such as IOUs, receipts and IOUs held by the parties does not specify the creditor, and the party holding the creditor's rights certificate brings a private lending lawsuit, the people's court shall accept it. The defendant raised a factual defense against the plaintiff's creditor qualification. If the people's court considers that the plaintiff is not qualified as a creditor after trial, it shall rule to dismiss the prosecution.