Bad quality jewellery

My mom bought a gold chain and earrings on 16 February, 2024 and it is already broken. American Swiss checked the purchase on their system, found the purchase, but does not want to exchange, as they need the slip, which I do not have anymore. My mom tried a silver chain, which she purchased two days ago which also broke today. Same happened to my daughter's chain. Bad quality jewellery and they do not want to exchange.