Replying to Use of photos in sponsored social media ads without permission or credit

I want to get a feel for how some of you have handled situations where a company uses one or more of your photos in a online ad or similar without previously reaching out to you ahead of time, or giving photocredit?

I have recently seen some of my own photos pop up on my Instagram feed in sponsored ads run by companies (I'll leave their names out) that I have never even been in direct contact with before. It seems pretty disrespectful to use someones photos for paid advertising without any permission or credit.

Curious to know how you guys feel about this...