Samsung A30 supposed water damage -IP68 in question as is the official service center of Samsung in boksburg

I purchased a brand new Samsung A30 cash this month on the 3/6/19 at MTN with the understanding of the specs in particular that that the device is IP68 rated for waterproofing. I note this specific spec because not two weeks later while on the phone with a battery life of around 50% the phone just died on me. I attempted to reboot the phone and only after a few hours with a hard reboot did the phone come on again just to switch off again a few hours later and since then the phone has not been able to switch on at all. I took the phone back to MTN who advised me to take it straight to the official SSService center in Boksburg which I did. The phone was booked in. The following day I received an email claiming that my warranty had been cancelled due to water damage and a quote was given of 3200 plus rand to repair. Firstly the device is in perfect condition, two weeks old, has never been near any liquid nor steam of any kind. Secondly even if there had been a splash on the phone as has been contended the phone is rated IP68 and therefore should not be damaged by that. Either the IP68 rating is bogus or the official service center is taking a chance or there is a serious defect with the A30 range which buyers should be aware of. Besides that a repair quote of 3200plus on a 4500 phone is ridiculous to say the least. So I urge Samsung to assist as not only have I bought a defective phone and am now 4500 out of pocket but your reputation and that of your range is in question. To be clear there is no damage on my device was in a protective cover since purchasing, still has the original screen protector on with no signs of moisture and the device has in its two weeks never been exposed to water or any liquid for that matter so please explain how the above has happened and I expect this to be prioritized and feedback to be received