The political influence or any external pressure cannot over rule the prevailing law in this regard.
Have you obtained stay of the execution of order and further proceedings in this regard in the writ petition filed before high court?
If so, you may wait for the trial by the high court in the writ filed by you.
The SDM's arbitral decision is against the law if what you say is to be taken for granted.
You should have been heard before passing any such order.
Moreover since it is in your possession for more than 12 years, you can perfect the title by operating the law of adverse possession also.
You can discuss with your advocate on the point of law of adverse possession.