Yea LINE is a pretty sophisticated app already in the free version - for example, you can group your friends and then create different sets of Voom posts for each group.
Then there's a business version. Many many highly automated ways to communicate with customers. Chatbots are quite easy to set up. Automated messaging is a sinch.
So if it is true that you receive automated messages, this "lady" of yours will be a chatbot ... good luck with that!