Law 18
5. Deliberate short runs
(a) Notwithstanding 4 above, if either umpire considers that either or both batsmen deliberately run short at his end, the following procedure shall be adopted.
(i) The umpire concerned shall, when the ball is dead, warn the batsmen that the practice is unfair, indicate that this is a first and final warning and inform the other umpire of what has occurred. This warning shall continue to apply throughout the innings. The umpire shall so inform each incoming batsman.
(ii) The batsmen shall return to their original ends.
(iii) Whether a batsman is dismissed or not, the umpire at the bowlers end shall disallow all runs to the batting side from that delivery other than the penalty for a No ball or Wide, or penalties under Laws 42.5 (Deliberate distraction or obstruction of batsman) and 42.13 (Fielders damaging the pitch), if applicable.
(iv) The umpire at the bowlers end shall inform the scorers as to the number of runs scored.
(b) If there is any further instance of deliberate short running by any batsman in that innings, when the ball is dead the umpire concerned shall inform the other umpire of what has occurred and the procedure set out in (a)(ii) and (iii) above shall be repeated. Additionally, the umpire at the bowlers end shall
(i) award 5 penalty runs to the fielding side. See Law 42.17 (Penalty runs).
(ii) inform the scorers as to the number of runs scored.
(iii) inform the batsmen, the captain of the fielding side and, as soon as practicable, the captain of the batting side of the reason for this action.
(iv) report the occurrence, with the other umpire, to the Executive of the batting side and any Governing Body responsible for the match, who shall take such action as is considered appropriate against the captain and player or players concerned.
I've prepared for the worst case scenario ...but it could be even worse than that
Some People are like slinkies. Not really good for anything but they bring a smile to your face when pushed down the stairs.