You can say anything you want to say , but I don't believe you.（改为同义句）

You can say anything you want to say , but I don't believe you.（改为同义句）
You can say anything you want to say , but I don't believe you.（改为同义句）

You can say anything you want to say , but I don't believe you.（改为同义句）
I don't believe anything you want to say.

whatever.No matter what you want to say,I don't believe you

whatever you say,i am not believe you.

❤Whatever..I do not believe you!
(无论怎样，我就是不信你！）
❤也可以说 Whatever you say,I don't believe you.
PS：第一种说法更地道一些