I had the same unfamiliar charge on my debit / credit card. Appeared to be a scam given that it originated from luxembourg, lu and i live in the us. After some research, i found that it is from full tilt poker. I is a charge that i did authorize, but did not recognize the online transaction company.
I JUST hung up the phone with my bank and told them to disregard my claim. I, too, did not recognize 'digital.call.' in luxembourg. When I read the response about fulltilt poker, I breathed a sigh of relief. THAT'S what the charge is for. PHEW! Guess I should read the confirmation emails that fulltilt sends me when I deposit money on my account.