S21 ultra false advertising

My boyfriend got the Samsung s21 ultra two weeks ago today, today we put it under water for not even 10 SECONDS It wasn't submerged more than 5 centimeters and the speaker is now crackling and the screen keeps freezing as well,

When phoning Telkom, they refuse to help and tell us to get ahold of Samsung

When you pay R30, 000 for a cellphone, and it is advertised as waster resistance for up to 1. 5 metres for up to 30 minutes It is disgusting to think that not even 10 seconds in 5 centimeters water, is something that will make the phone completely glitch out And typical Samsung they won't assist or do anything and they wonder why they loose customers to apple. Sickening.