This negative review is driven by Chanel corporate lack of transparency in its return policy and could have happened in any one of it US stores - the review is linked to the actual store were the purchase was made.
My wife owns a number of Chanel luxury items, as well as products from other similar high-end brands. In this instance, she was interested in a watch and with the help of the sales agent (who was friendly & accommodating) selected the product that she thought she wanted. Immediately on leaving the store she had second thoughts and the following day she went back to the store to try to do a return. The product had not been worn, or even removed from its packaging in the intervening 12-hr period.
On returning to the shop, she was told that a return of the money that was paid for the watch was not possible and the only option was to do an exchange for other items in the store as this was the corporate policy. We challenged that we believed this is not normal in the US and we had not been told this by the sales agent. The Manger of the store was summoned and was very firm on the issue and pointed us to the sales receipt where it does indeed say that Jewelry and Watches can only be exchanged, not refunded. This felt very much like a "Corporate Gotya" as, of course, we only get sales receipt after we have already paid for the product.
A subsequent search on the Chanel website (as of this review date) confirms that nothing is mentioned about a no-return policy on Chanel jewelry, or watches.
So the message to other potential buyers of Chanel jewelry or watches is be very aware that once you have paid, there is a enforced non-return policy - your (commission based) sales agent is unlikely to tell you this up front and you will not find it on Chanel's website.