ULPT Request: Coach took my money, gave no lessons, ghosts me. Get refund ?

Hi everyone,

I'm looking for creative but effective ways to pressure someone into refunding me. I'm not looking for anything illegal that could backfire on me.

What happened: I'm currently dealing with depression, and I wanted to take up tennis lessons to get back into physical activity and feel better. I found a private coach through an online platform and paid for a full pack of lessons upfront. Since then, he's given me one excuse after another and never actually delivered a single lesson. Now he's ignoring my messages and refuses to refund me. His listing on the platform has since been deactivated (from my report to the platform).

The money matters a lot to me right now, and this has hit my finances hard. There was no written contract, everything was agreed verbally, though I do have messages and proof of payment.

What I've already tried: messaging him multiple times, checking with the platform, asking to refund and threatening him to inform his employer about his activities.

What I'm asking: I know who he is, where he lives and where he works. So what are the smartest ways to make it more costly for him to ignore me than to just pay me back?

Has anyone been in a similar situation with no contract? What actually worked? Anything I'm missing?

Thanks in advance.