Cancel Approved Family Visit Visa

i want to cancel family visit visa as one of my colleges was helping me filling the form for visit visa ,he chose multiple for 730 days. which has been been approved and now i want to cancel and issue new visa for 90 days. please guide me how to do this. i tried filling the form again but it gives me a message visa already issued with application number.

sir please let me know how you dealt with this issue
facing the same
thanks in advance

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