Lame execuse to reject my return and super rude customer service

I am a runner and on some days, I participate in strength training (gym). I am very particular about what type of shoes I wear for running as well as gym. Size and shape is very important.

I bought size 6 pairs on "Flexagon Energy Tr 3" Shoes for strength training. Although the length (heal to toe) was perfect with a little space, the specific release is too cushioned at the cost of the space inside. In other words, the shoes are too narrow inside and squeeze the feet. Hence I ordered the bigger size. Because there was no half size, it means size 7. In this case, the width was perfect but unfortunately, those pairs were too long. I tried them on at the gym (both the 6 and 7) in front of my instructor and he told me right there that they were the wrong type. (I didn't wear them for the session).

Now, when I tried to return both, Reebok consultants came back claiming that the "bigger ones are not in acceptable conditions" (I think because they found dust at on the outer sole). I described to them that all I did was fitting.

I've made clear to the consultants that there is no way I can wear those shoes because they are unsafe. One would risk being injured wearing too narrow (size 6) or too long (size 7) for high intensity exercise. I could accept cash back or a credit to buy another item.

I'm super disappointed at, not only the greed, but the way they justify it. If you go to rating sites such as run repeat (https://runrepeat.com/reebok-flexagon-energy) you will clearly see that they are in fact narrow. Yet the consultants are trying to force it back at me by threatening "If you don't take it, we will donate it". One of the consultants was speaking to me as though I was a ********. Her conduct was as if she was investigating and looking for holes in our conversation. I never had such type of experiences with Takealot, and sports specialists like TheSweatshop.

If I damaged the shoes (wore them or tore them) I could I understand, but that didn't happen. The consultants are trying their hard as if their roles are literally getting rid of the clearance items instead of a fair business.