I sent one email using the contact form and one through my email asking for Platinum challenge within 5 min of each other.

I stated I was SPG Plat, Hilton Diamond with over 150+ travel nights out of the year. I also named my company and included a professional signature, made sure the letter was written professionally.

I received two emails the next day within 5 minutes of each other, one offering gold (from the contact form), another offering platinum (from the personal email).