Don’t be discouraged by the language learning. Most places you can find intensive classes that meet several times a week. It’s also a matter of studying and absorbing as much comprehensible input as possible. Surround yourself with the language like you’re a baby learning everything about the world anew, and you’ll be amazed at how quick you pick things up. Our brains are literally made to learn language, after all :P

It’s Spanish, not French, and OP states in another comment that the other side of the letter is Spanish as well. The mail is targeting OP’s wife using demographic info, probably purchased from a data broker, because she has a Venezuelan background.