I got the following response today, which appears to be a mix of canned and customized paragraphs:

"Thank you for your email.

I have confirmed that more than 45 days have passed from the purchase date. Since the reward for this order is rather large, it is our policy to investigate with the merchant to find out why it was not credited and attempt to obtain payment for the order in order to pass it back to you. Therefore, I am sending this order to be investigated immediately. Because a third party (The Motley Fool) will now be involved, we ask that you please allow 4-8 weeks for a definite resolution. However, we hope to have this issue resolved much sooner than that.

A representative will follow up with you periodically to let you know the status of your case.

Please note, on all orders purchased via AAdvantage eShopping, taxes and shipping fees are not eligible to earn miles. Also, keep in mind that all elevated offers end at 11:59 ET on the last day of the elevated offer run time.

Be aware that when you click over to the merchant site from the AAdvantage eShopping site or activate the Button, you will see the number of miles offered at that time by that merchant. If an eligible order is made following that click or activation, you will be rewarded the displayed miles. This mile offer may change from time to time.

Our records indicate that on August 6, 2018, AAdvantage eShopping was offering 7400 miles. Since we have no record of the offer that you are describing, we are unable to add more reward miles to your AAdvantage eShopping account.

We deeply appreciate your understanding in this matter and your continued patronage. Do not hesitate to contact us if you have any other concerns or need additional information.

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***In order to answer your questions in a timely manner, please reply to this email with any further questions or additional information relating to this inquiry.

Regards,

Axxxxx
AAdvantage eShoppingSM Customer Care"
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I'll give them the stipulated time frame of 4-8 weeks, and after that I will highlight the issue to credit card company. Normally, when you dispute for non-fulfillment of service/contract there is a time limit of 90 days or more so hoping I can hear before that. Similar to others, my purchase appears in the merchant click-thru history on AA portal but not on purchase confirmation section. Fortunately, I had send them an email few days after and got them to acknowledge the purchase as one of the other poster highlighted.
If enough of us pressure either Cartera/MF they may end up doing the right thing. But it is still a waste of time for to be taken into such stupid gimmicks.