Design Flawed designer sunglasses!

I bought my wife a fancy pair of sunglasses from the Burberry Hyde Park store 3 years ago. She liked them very much and for the first two times she tried to wear them she would endure the discomfort due to a thought that they would sort of stretch and become more comfortable. After realising that they were not getting any better she put them aside and revert to her other sunglasses. A year later I realised the she was not wearing them due to the problem so I went with her to the store with this complaint. We were turned back and told that we waited too long. Granted, we took them and went back home. My issue now is, i have tried to sell these glasses now on and off for the past 2 years...Everyone who tries them on, has the same complain with them, my wife is a petite person and including the people who have tried these on that we tried to sell to. I'm alluding to the fact that I am now convinced there is a design flaw with these glasses and i've compared them with other designer shades. The shape will not fit anyone without squeezing the back of the ear. I'm especially disappointed in the fact that this is an internationally acclaimed designer brand. This is just so disheartening and we need to find a resolution for this.