Not return mobile parts

I bought a part for my Toyota in December 2022. Then me and the mechanic wanted to replace the part on the V-belts on the engine. We then realise that it was a different part that caused the problem. We replaced that and all was fine.

Now I want to return the part to Goldwagen in Wierdapark. They said that they can't accept the return because the part is more expensive now than the time when I bought it initially. The way I think: The price doesn't make a difference. Return it and refund the value that it was bought for. Put it back in stock and sell it.

This is not good. I don't have any use for the part now. It is not good service and I will not support them again.