Amazon India — technical issue

Address:

B-11 RATNASAGAR COMPLEX,OPP. GULAB TOWER,THALTEJ, 380054

I have placed an order for samsung m20 on 11-feb-2019. I am facing issue like hanging on scrolling, sensitivity issue so i use return policy for that reason. I also compare my phone with other m20 it will work good than my phone. Amazon supervisor said there is no problem and give rudely answer and before coming he call me and ask me to i will come or not that's not question and he is teach me how to use phone. I am also technical person i also know what's problem in my phone. And supervisor said that you can go samsung care. If i am available to go samsung care so why should i by anything from you site???
Please give me proper solution for my phone.