I have tried on all of my different devices on and off wifi on both of my accounts and on every browser possible but i CANNOT BUY THIS VERSION OF MINCRFT FROM MINECRAFT.NET

I have tried on all of my different devices on and off wifi on both of my accounts and on every browser possible but i CANNOT BUY THIS VERSION OF MINCRFT FROM MINECRAFT.NET. i have tried everything your help page has said to try but still nothing.