Samsung wearable devices no SWEAT proof

I have bought 2 Samsung wearable devices a Gear fit2 pro and Samsung galaxy watch the galaxy watch I bought in March 2019, and I bought it because the gear fit2 pro had to go in for repairs because the glue on the glass casing for the sensors was coming off (this is a design flaw that Samsung is well aware of they have even changed the casing for the sensor on their latest Galaxy Watch Active2 to address this, but of course they won’t admit to this), now again the same thing happened to the galaxy watch (glue was coming off the glass casing the sensors) and I took it in for repairs at Mall of Africa Samsung store, now after they fixed it, hardly less than 6 days the watch overheated and it just stopped working and one can clearly see glue incorrectly placed on the sensors of the watch which I believe is the reason the watch over heated and stopped working, now the same guy who repaired it the first time wants to tell me that I am liable for repairs and he hasn’t even done an assessment on the watch, busy asking me is I sweat a lot if the glue came off cause I sweat a lot Samsung should warn customers that the watch is not sweat proof and should not be used for any activity where one will be sweating. They should stop with the false advertising that the watch can be used for sports activities. I just want my watch fixed with no stories; may I please get assistance with that.