Just got one of these too. Calling the number back gives you a "number has been disconnected" message. I'm 100% white and all my bills are in order, so I have no idea why I'd get a call from a Spanish collection agency. I'm guessing fraud from an old landlady.
At the start of my phone call, I heard the sounds of an old-fashioned cash register in the background and thought someone was calling me from a store. Then, the spanish message started. No one on the line to actually talk to.