Not been paid holiday pay from agency

Anyone know of a legal team that can go after an agency? I’ve not been paid for 60 hours annual holiday (and so have a few other drivers looking at Trustpilot).
They’ve been ignoring my emails since early December and a request for their grievance procedures has also been ignored.

Can you not visit the agency in person? Better than email if near enough to visit

Paying a legal eagle to recover your money probably would leave you with very little, for an amount this small you could try a small claims court application, but first make sure you weren’t on a “rolled up holiday pay” scheme

No, they’ve paid me 30 hours.
It seems they are doing similar to other drivers at Barnsley.