Hi Maria,
We’re sorry to hear that you were disappointed with your experience.
We always do our best to assist our customers and provide a fair resolution based on our Return & Exchange Policy. In this case, our records show that you initially contacted us after trying both Sizes and confirmed that you would be keeping the Medium. The mark on the Medium was reported afterward.
All of our products go through a quality-control inspection before being packed and shipped. Because of the timeline and the condition requirements of our policy, we were unable to approve the Medium as a defective-item replacement.
We also want to clarify that you were offered both the option to return the Small or exchange it for another available item/Size, provided it met our return and exchange requirements.
We understand that this was not the resolution you were hoping for, but we always aim to apply our policies fairly and consistently while assisting our customers as much as possible.