Iphone 5s caught fire while on charge
Hi, i gifted iphone 5s to my sister on her anniversary there was an issue with the phone it was heating so service center replaced the device and gave me after lots of try , and now few days back the phone caught fire while kept on charge and after speaking after speaking to customer care people told that phone was tempered and in the case phone was never taken to service centre before , I don't know what kind of service is provided by Apple my first experience with Apple iPhone 5S is the worst experience and in future will never buy an Apple product, my god grace my sister had minor injuries on her hand and she was using the phone while it was kept on charge and as soon as she is saw the Flames from the iPhone 5S by which phone broke down into pieces I send the images To Apple Support center but it took two to three days to respond the same and stating that phone was tempered can anyone suggest me what can be done to solve this issue.
Thanks
iPhone 5s, iOS 9.2