This happened to us also. They were giving us drinks during the presentation.
I didn't realize how strong the drinks were until I got up to use the restroom and couldn't walk straight. Both my husband and I were under the influence and quite giddy at the time. Neither of us drink much alcohol normally. In retrospect, I thought there must have been more than alcohol on those drinks because both if us would have been turned off by a strong alcohol taste.
We were so embarrassed by this experience and actually traumatized. We will never feel safe travelling to Mexico again. Our experience was in Cancun. We immediately cancelled our credit card upon returning home, contacted the resort and after being subjected to severe guilt trips and much arguments and being yelled at by the salesperson, we got all of our money back except $900.
We considered this the cost of our education on this topic. Never again will we attend a sales session regardless of the promises made.