I'll have you know - Wiktionary, the free dictionary

I'll have you know

1. Used to add annoyed emphasis to an associated statement.

   Synonym: for your information

• “i ll have you know” in Longman Dictionary of Contemporary English, Longman.
• “I'll have you know”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.