Liberty Online Services ILD Services Yellow pages free listing turned into charge on my phone bill Nationwide

I was called by an online yellow pages company at least 3 times, asking to verify my business name, address, etc. for a free listing on an internet yellow pages directory. I reluctantly agreed, because it was free. They asked if I wanted an additional service and I declined. I found a bill for $30.85 on my phone bill a month later from ILD Teleservices whom I called and learned the name of the company who billed me. I canceled, but I'm still on the phone with them trying to get a refund.

Michael
Olney, Maryland
U.S.A.