Hi, definitely a recording, it's in spanish, says:
"Su atención por favor, esto es radio Nueva York, esta frecuencia está asignada únicamente para el uso de comunicaciones aéreas civiles en el servicio aeronáutico móvil, usted está en violación al derecho internacional causando interferencia a la seguridad de (this I can't understand, sorry) de vuelo, por favor, cambie a otra frecuencia de trabajo autorizada, esto fue radio Nueva York"
Meaning something along these lines:
"your attention please, this is New York Radio, this frequency is assigned for the use of civilian aerial communications on the aeronautical mobile service, you are in violation of international law by causing interference that affects the safety of (sorry, still can´t get it) of flights, please, switch to another authorized frequency, this was New york Radio".
Hope this helps.
Just for the record, I don´t think the guy in the recording is Mexican, I'd say he has more of a Caribbean Accent