Galaxy S5 Not to water resistant

My Samsung Galaxy S5 is a wonderful phone. I have used it on various occasions to take lovely pictures and a lot of underwater pictures and it worked really well. I ensured not to take it deeper than 1 M and never longer than 10 minutes. Then it happened that I took a picture underwater and after that the phone didn't want to switch on. I took it in to the Samsung dealer in Brooklyn and they repaired it with no problem what so ever.<br> <br> However, after the repair, the first time my phone went into water again, it stopped working. Again I took it in to Samsung, but this time they are charging me almost R6 000 to repair it. Saying that I have one screen repair and one water damage guarantee on the phone. According to me this phone is water resistant and water damage should not even be possible on this phone. The phone was definitely no deeper than 1 meter as the pool (pond) was not even that deep and it wasn't even 1 minute. The phone is 18 months old and according to the warranty, it has a 24 month guaranty.<br> I would like to know how it is possible to have water damage on a water resistant phone that was used exactly as it was instructed to be used<br> Attac