Received expired amendment petition , can i eligible for extension

Recieved approved amendment yesterday with expired valid date of 15 March 2018 and i-94 till 25th March, and was approved on 27 April 2018. Situtaion is currently I am India and have my return ticket booked . Can anyone advise what i can do it now. My current stamped visa is valid till 25th Dec 2018 and has i-94 online showing valid till 25th Dec 2018 for different location and client. Appreciate if anyone has any suggestion on this situation.