Very unusual because I signed up for the card in September, and received my card in the mail about 2 weeks ago. I subsequently sent an email to Frequenta requesting the transfer to my HHonors account and received the following email in response:

Thank you for your e-mail. The request to transfer 5,000 kilometers from each Frecuenta account to 10,000 Hilton Honors points (each account) has been requested. Please allow up to two weeks for the points to show in
your Hilton account.

Thank you,

James-Anthony Trevino
Mexicana Airlines
Frecuenta Dept USA

I checked my Frecuenta account online, and it shows the miles going out to Hilton on 12/5. Did the same thing for my wife's account and it worked the same way with the same letter.