Samsung S8+ frozen and unusable

I am very disappointed and frustrated with the Samsung S8 plus. I upgraded from my Samsung S6 edge plus to this device in November last 2017. All I'm left with is regrets! The phone seemed to work fine in the beginning, but then after a month or so it started freezing and being unresponsive, especially when the Messages app is open or when I make and end calls. This made caused me to lose a lot of unnecessary airtime because the phone wouldn't hang up after a call but I could sort of live with it to some extend. Now the worst has happened! Since yesterday, the screen is frozen, especially the top half of the screen and the phone is unusable. I have tried everything possible from the internet to resolve this issue by doing a hard reset, updating all my apps et cetera, but nothing works! Samsung should replace this device with a brand new one that works properly ASAP. Please do not tell me to take it in for repairs because that does not work for me. I have suffered a lot in the past with my Samsung S5 that I had to take in for repairs with the same issue 4 times before they could replace it. If nothing is done about this, I am throwing this piece of ******* in the bin and I swear to never buy any Samsung device again in my entire life.