How to update signature in vakalatnama ?

Q: HELLO I WANT TO ASK IN TITLE SUIT(HINDU LAW) IS THERE ANY PROCEDURE TO CHANGE OR UPDATE THE SIGNATURE IN WAKALATNAMA I AM FROM MUMBAI .MY CASE IS IN PATNA IN WHICH PRELIM DECREE HAS BEEN PASSED BT THE COURT . I FILLED AN APPEAL IN THAT CASE . ACTUALLY I LIVE OUTSIDE FROM THAT STATE WHERE MY CASE WAS LODGED SO MY LAWYER FILLED APPEAL IN BEHALF OF MY SIDE AND I WAS NOT PRESENT THEIR WHEN HE FILLED APPEAL . HE TAKEN TWO WAKALATNAMA SIGNED BY ME AND MY MOTHER EACH SEPERATLY AS WE AR TWO DEFENDENTS IN CASE . NOW HE SIGNED MY MOTHER SIGNATURE IN MY SIGNED WAKALATNAMA ALONG WITH AFFIDAVIT AND SUBMITTED APPEAL IN DISTRICT COURT . I JUST GOT TO KNOW THAT HE HAD DONE THIS AND I DONT KNOW WHAT TO DO NOW PLEAS SGGST ME IS THRE ANYLAW IN IPC TO UPDATE SIGN IN WAKALATNAMA AND AFFIDAVIT OR MAKE THAT INVALID AND UPDATE WITH THE CORRECT INE THANK YOU