Not treating customers fairly and not being reasonable about returns

Purchased Nouvelle Pots from Cielo, which started rusting after a few months. Raised this with them, and despite trying to state my case that I followed the care instructions as per the warranty ( I even shared the warranty document to prove my point that I didn't do anything that wasn't advised ), they still refused to treat me fairly and accommodate my request. I was shown no respect and consideration ( and this matter wasn't treated with urgency) and didn't even bother engaging in conversation with me and constantly just said that the decision remains that they won't accept the return request. Hardly the way to treat a customer with no proof of wrong-doing and definitely not considering my rights as a customer-- I have the right to return defective products, within the warranty period, especially if I did what I was told to do. The care instructions you quoted in your mail, is mentioned no where in the document that I got with the pots and yet you never commented on my response. In addition, although you are convinced that the warranty doesn't cover rust, it is reasonable to expect you to, based on what I said, still try meet me halfway. I will definitely not be purchasing anything else from this store, because I clearly will never be able to return anything.