Did DRS CONTROVERSY deny Bangladesh a win over South Africa?

On second ball of 17th over, Mahmudullah was given out lbw by umpire. The ball travelled to the boundary with no one near to stop it. Mahmudullah opted for DRS & decision was reversed. However, no run was given.

On second ball of 17th over, Mahmudullah was given out lbw by umpire. The ball travelled to the boundary with no one near to stop it. Mahmudullah opted for DRS & decision was reversed. However, no run was given.