Its wierd that happened. Normally, a significant damage like that is cause by impact damage. I suggest bringing your phone for service in the nearest samsing authorized repair store. For more info click this link https://www.samsung.com/us/support/service/locations/ hope this helps.
Sorry to hear you went thru that . It sound like you probably had a pressure crack. You should get your device inspected either in a Samsung walk in center, UBIF or request mail in service . Here the link to help : https://www.samsung.com/us/support/service/
Hey @userNxjnLWHqdl ,
Im sorry to hear about your issue and you should contact Samsung to find out their repair policy.
You can find the contact information online through the Contact Us or you can even chat with a representative through the Samsung Members App. I advise being very careful with your phone as it is no longer water resistant.
Hope this helps!