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on 3/11/19Muy sencillo responde rápidamente amigo tan sólo envíales un correo y en poco tiempo te lo responden
Extremely. They responded to every email within 48 hours and were extremely helpful, informative, and courteous.
Easy by e mail, but you have to wait for a reply, up to 24 hours due to time difference to China, and not at weekends.