Unpaid photography being used consistently on social media

Hello all.

I had a client for 3 years where I produced their social media posts. My contract was just social media posts (a set amount of hours a week), and if any photography was needed - it would be paid at a higher rate and per hour. They gave me photos to do and refused to pay me every time I asked by saying that I should be happy I have that work (the social media) as they might need to let me go. They even barely reimbursed me for props and backgrounds used (I had to beg for reimbursement and they limited how much I could expense). I have multiple emails complaining that I was not being paid for this work. They ended up letting me go March 2025. A year later whomever is doing their social media now is using all my unpaid photography for reels - and I feel this is unjust enrichment for the firm?

Also to note these were not quick photos, they were still life photography with props, which required days of cutting swatches, steaming fabrics, searching for the right props and backdrops, and a lot of coordination/layouts/styling. Some sets of images took days to produce time wise. Some were used in magazines, and they are also all over their website.

Edit: I was an independent contractor - for social media only.

What should I do?