If somebody says this, they mean that they have some complaint to make against the person they are addressing.
I've got your number
You have made a mistake and I am going to call you on it. You are in trouble (a threat). I have a disagreement with you. I understand your true nature.
An I've idiom dictionary is a great resource for writers, students, and anyone looking to expand their vocabulary. It contains a list of words with similar meanings with I've, allowing users to choose the best word for their specific context.
Cùng học tiếng anh với từ điển Từ đồng nghĩa, cách dùng từ tương tự, Thành ngữ, tục ngữ I've