Samsung A50 water damage

I purchased an new cell phone activated on 08-04-2019. My previous phone was a different brand which was selected for its waterproof specification. The choice to change to the Samsung was based on its specifications. The lack of waterproofing taken into consideration. When the unit was collected from the store, the package was opened in the store, a protective cover, and a protective screen saver were installed, by the Samsung rep who happened to be in the store at the time. (This phone has been seriously looked after) About 2 weeks ago the phone reported that it was overheating, and was shutting down certain apps. About a week ago the phone refused accept a charger, showing an overheat screen. The phone was booked into a Samsung smart care centre under warranty. The booking in procedure was quite intensive. The protective cover was removed, the screen saver was removed ( it had cracks in it). The screen itself was visually check for any damage. The unit was photographed numerous times. The report generated stated that there were "black scratches", as the only visible signs of abuse. The phone was in near perfect condition visually. No signs of liquid externally The Samsung smart care centre has sent me a quotation, quoting "liquid damage" as the cause, thus voiding the warranty. They have sent me photographic evidence of the internals of the phone, where it is clear that water damage has occurred. I have to accept that it is in fact my phone that they photographed. The quotation basically says they have to replace numerous components, which is quite costly. I am extremely disappointed in this product, bearing in mind that I have had cell phones from just about the introduction of cell phones to this country, and this is the first brand that has ever left me this dissatisfied.