Wrong amount entered against a invoice

Dear Respected Members,

 I have raised a bill to AIIMS Bhubaneswar, for a particular amount, but during GST input i have entered a higher amount and paid higher GST against the same invoice. Due the same the institution has hold my GST amount from the bill. Can you please suggest how can i make correction and the procedure for same so that i can revive the bill.

Thanking You

Subrat