Unacceptable American Swiss Jewelry Damaged

My dad lay-buyed a ring for my mum and paid the last installment on the 19th November 2022. On the 2nd December my mum went on a cruise and when returned after wearing the ring for the 1st time, she noticed the ring was damaged. She went to the store it was purchased on the 11th December to ask for a a refund but the store assistant insisted that they repair the ring. She gladly accepted, she thens speaks to the manager who advised they will need to charge for the repair as this was negligence and insisted the ring was smashed. My mum insisted this was not the case and assured them that she only used the ring once since receiving it. They asked for her to pay for the repair, she said no and left the store. THIS IS UNACCEPTABLE. THE STORE MANAGER AND STAFF WERE EXTREMELY RUDE AND UNCOURTEOUS. I had once bought a ring for over 50k and when going to pick it up noticed diamonds missing which the store admitted was their fault. They had it replaced. I did not take that up considering the amount I spent. My mum is 60+ and really didnt expect such poor quality and treatment from the a brand and store that we have been buying for years. I will like a refund or a voucher to purchase at another American Swiss store as i will never be going back to that store. If not, I will be laying a compliant with the consumer protection act as this was taken with the 30days of purchase and there was no negligence on my mums part.