A new trial shall be granted, upon contradictory motion of any party, in the following cases:
(1) When the verdict or judgment appears clearly contrary to the law and the evidence.
(2) When the party has discovered, since the trial, evidence important to the cause, which he could not, with due diligence, have obtained before or during the trial.
(3) When the jury was bribed or has behaved improperly so that impartial justice has not been done.
Acts 1983, No. 534, §10.