Grant Cardone supposedly created a multi-million dollar business in just 90 days, however, fans have discovered red flags when it comes to his honesty. Undercover Billionaire strips back the ultra-wealthy and challenges them to rebuild their fortunes and businesses with just $100 in their back pockets. The idea is to see if these supposed business moguls can build something, from nothing, in just 90 days. Season two featured Grant Cardone who held the titles: international motivational speaker, real estate investor, sales trainer and author. However, since the show aired, fans are questioning …