There are a few things you can do to stop someone from messaging you on Instagram. First, make sure that your phone is unlocked and that you have the latest version of Instagram app installed. Second, be aware of who your contacts are and only send messages to people who you know will be interested in what you have to say. Finally, be careful about what kind of messages you send - some people may find it difficult to read or understand English language messages, so it’s important to be clear and concise when writing them.