Duplicate din - how to cancel

Hi,

when i was uploading the DIN 1 for the first time, the system shown the error message and transaction was not complete.

i uploaded the form once again and the transaction was successful and there was no message about the potential duplicate.

but both the forms are accepted and two din were allotted to same person.

Kindly let me know how to cancel the duplicate din allotted and rectify this mistake.

Regards,

Uday.