Client photography

Hello everyone, I don’t usually take the time to post here, but today I could really use your advice.

I’m a freelancer and I’ve been working with a client for over 8 months: I manage the social media for his three restaurants, including photography and video.

A while ago, he opened a new restaurant and asked me to do just one photoshoot for this new place (no contract). For that first shoot, I delivered around 30 photos for $300 (I still haven’t been paid, but he always pays — I’m usually not in a rush with him).

The day after the shoot, he asked me to send the photos quickly so he could forward them to someone in “PR.” I asked what he meant, and he said public relations.

Now, about 3 weeks later, I’ve realized my photos are being used on dozens of websites (articles about his new restaurant), as well as in Instagram posts from agencies — and none of it includes any mention of my name or photo credit.

I’m honestly frustrated and I’m not sure what to do or how to address it properly. In your opinion, what would be the best way to handle this?