deep and hard up the middle is often a good receipt against angle guys. of course only if you have the consistency to pull it off.
sometimes hitting DTL approach shots can work however then you also open the court for a CC passing shot. so you should only do this when your approach is good or the opponent only angles well off one wing (usually FH).
It is also quite easy to counter angle the angle shot (an angle opens the court for the opponent too) however you have to consider that he then can counter angle you even more. you don't want to play his game so only use the counter angle occasionally.