Presumably there is some sort of warning / sanction for unsportsmanlike behaviour. Probably just a severe ticking off - words with the captain - report to match referee (if there is one) etc... ??
It is all here... in the LAWS.
Law 29 (Batsman out of his ground)
1. When out of his ground
(a) A batsman shall be considered to be out of his ground unless his bat or some part of his person is grounded behind the popping crease at that end.
(b) Notwithstanding (a)...
It is a NO BALL.
24.6. Bowler breaking wicket in delivering ball
Either umpire shall call and signal No ball if, other than in an attempt to run out the non-striker under Law 42.15, the bowler breaks the wicket at any time after the ball comes into play and before he completes the...