Lost me as a customer

I received some infant clothing as a babyshower gift and unfortunately the person that bought them is inexperienced as a mom.

She bought extremely small clothes from your store and lost her receipt + removed the tags, as it was a gift.

I am trying to literally just EXCHANGE the clothes for a bigger size, but its ridiculous that you guys cannot help.

The label on the clothing literally shows that they are from your store and have never been used. Literally received last week.

I am disappointed that your store doesnt have the same courtesy as other stores.

You have just officially lost me as a customer and I will surely make sure I spread the word amongst my circle. To shop in decent shops that actually help customers and understand