Samsung S24/S25 ultra ip68 water rating a lie?

I have got a Samsung S24 ultra which I had for just over 12 months now, after my charging block failed and came up with and error that read moisture detected in charging Port regardless of there being no water near the phone i took it to a Samsung authorised repair center in Alberton the Vodacom shop in New Market center. They replaced the charging port under warranty....

Fast forward two months and I drop my phone in the bathtub while filling water,it falls into water less then 200mm deep for less then 25 seconds and the screen goes blank...

Bear in mind that I bought this phone because Samsung claim it can be in fresh water less then 1.5m deep for 30 mins as its ip68 rated.

The store say its impossible and claim its a false marketing claim from Samsung and quote me 6999 for a repair of my screen.

I pay for it and receive a phone back which is faulty, the screen goes blank the phone also gets hot at the back from time to time but the approved Samsung store claim its normal and its a setting.

Is this the partners Samsung chooses ?

Or are they lying about the phones being ip 68 rated?

Should we dunk my phone infront of them as a test?

I have contacted Samsung and the procedure seems pretty decent however they want to refer me to another 3rd party contractor which I refuse to do as I want a Samsung repair center to deal with this as I was told by the other center that they have never heard of phones being able to be submerged regardless of them now selling the s25 ultra...