I am sorry you ran into a problem. And then you had to run into a group of people who are too high on pixie dust to look at your point of view.
Just exactly how high are your expectations that you would expect a CM to be able to answer a simple ticket question. Shame on you.
And go ahead and count on your fingers. I do too - arrival on the 6th, (6th - 7th) 1 day, (7th - 8th) 2 days, (8th - 9th) 3 days, (9th - 10th) 4 days, (10th - 11th) 5 days, (11th - 12th) 6 days, (12th - 13th) 7 days, (13th - 14th) 8 days, (14th - 15th) 9 days, (15th - 16th) 10 days, (16th - 17th) 11 days, (17th - 18th) 12 days, (18th - 19th) 13 days, (19th - 20th), 14 days. Gee, imagine that? We ended up on the 20th! It can be a little confusing. That is why you asked about it. Believe me, I know. I asked a CM and was told the exact same thing. Luckily, we didn't hit the last day like you did.
Now, why don't we take a look at how he was treated when he tried to use the seventh day. Here was a customer, repeating one or not, that had purchased 7 day tickets. He was one day past the Disney expiration date. I repeat, one day. And he even explained that. And still, he is told he can't use them. It's not like he was there two months after they expired. A company offering good customer service would have recognized this and explained that they were one day past the date, apologized for him being given the wrong information and admitted him to the park. The problem is, Disney has now become a company focused more on money than their guests. You argue that all you want, but we have been 8 times in the last 10 years and service has greatly declined in the last three years.
I used to work in complaint management. I attended classes on how to handle unhappy customers and I have taught classes on customer service. I used to use Disney as an example on how it is done right. Not any more. They don't cut it anymore.
I didn't mind paying more for Disney. But, it has now gotten to where my family is paying more and not getting more. We are planning a vacation for next year and for the first time in ten years, it will not be at Disney.