Will it be illegal for me to call an unscrupulous liar? She sent scam messages to my mobile phone, and my mobile phone received several scam messages. Who are these liars?

It's not illegal to call you a liar. There are many liars in real life, everyone hates them and everyone wants to punish them. The current law is that only when you have enough evidence can the law punish the bad guys. So, protect yourself, don't be fooled by a liar, just forget it, and don't be angry with such a villain. . If there is real evidence, call the police.