TELKOM BAD SERVICE!!

I took a contract phone with them the name of the phone was p40 Pro which is a water proof.. Am paying R900 per month for it.. So my phone fell in the water and the screen started acting up on the second day when it became worse I went to the store at mall of the North they called their Technician he asked what happened I told him my phone fell in the water water but to my surprise its a water proof so I don't understand why its acting up.. The guy asked if I had the insurance and I said No he then said warranty does not cover the screen even if its not broken and worse even if I take my phone to be diagnosed is just a waste of my time because Telkom won't admit on being in the wrong the company will always bring something that says a I am in the wrong because he is also not sure if its water proof or water resistant.. I told him to call the manager the manager advice me to fix my phone for my self since well the company will not assist in fixing it.. Its been 7months now paying for that phone and I still have to pay it for the full 3years