Netflix very rarely offers free months directly, and when it does, it's typically:
Algunas tarjetas bancarias (como las de BBVA, Santander o Citibanamex en México) ofrecen reembolsos o meses gratis en Netflix. cuentas 3 meses de netflix premium gratis link
If you're interested in legitimate ways to save money on Netflix, here's a helpful article: Netflix very rarely offers free months directly, and