Marriott Bonvoy™ American Express® Card

October 31, 2018, I applied for the 100,000-point Starwood Preferred Guest American Express Luxury Card. Before I applied, I called AMEX and spoke to Customer support and asked if I was eligible. The AMEX representative reviewed the terms and conditions with me and looked at my past records and stated I would be eligible. I told him I had had the Chase VISA Marriott Rewards Premier 80k points in Jun 2016 and AMEX SPG in July 2015 and the Chase Marriott Rewards® Premier Business credit card 80k in August 2015. I was told I am eligible because I have not had the Starwood Preferred Guest American Express Luxury Card which has a $450 annual fee. I applied online and was approved instantly (there was no warning message during my application I was not eligible). A called AMEX a couple of weeks after I received my card and they assured me again if I spent 5K in 3 months I would receive 100,000 Marriott points. I called AMEX after approximately 75 days and AMEX confirmed I had met the $5K spending requirements and would receive the 100,000 bonus points in a couple of weeks. A month passed so I called AMEX for a status. I was rudely told I have a “Welcome offer history” and would not explain any details. I spoke to a supervisor and they stated AMEX can deny for any reason and this is what they exercised. I was told it could be because I abused points or took points and cancelled the card. I told her I have always try to follow the rules and even called in ahead of time to ask AMEX if I was eligible.
I asked appeal and asked for their corporate office address and process to appeal. A few minutes later I called AMEX again in hopes to speak to a more courteous supervisor. I spoke to another supervisor Matt. He was very nice and could not figure out why I was declined either but could only speculate. The only thing he could think of is AMEX and Chase have recently got together on the Marriott/SPG merger and are trying to root out churners. He went on to say this is a new policy only in the past couple of months and AMEX is trying to work out the details on how to stop churners. He stated he would file a case on my behalf but stated he has never seen one overturned. He agreed I did everything right. This is contrary to what I have read about AMEX “warning” users if they are not eligible. The same thing happened to me back in Sep 2016 when I applied for the AMEX Delta Gold SkyMiles card 50k for $2k spend. Only “after” I spent the $2k was I told the limit is once per lifetime and never received the bonus. Any ideas what options I have in this case?