I think the OP is making the mistake of hitting on the toe/heel of a real putter, with missing the ding on the game.
In the game you have to visual it as if the club face is open or closed. That is the same as missing the ding. If you putted a 3 ft putt, with your club face open, it will not go straight. The ding isnt determined by hitting toe/heel. So that is why your confused, and frustrated.
At the end of the day, this is a virtual golf game. This is meant to be fun, and I find it really fun. I enjoy myself, even if I dont putt or hit the ball well.