Cancellation of GST Registration and Officer asking for Future Correspondence.

Dear All,

One of Our client is Willing to cancel the GST Registration, while we appling for Cancellation, Central Jurisdictional Officer asking for proof for Future correspondence, we have given the Aadhar Card, but he rejected.

Hence please guide us that what is sufficient document proof for Cancellation of GST Registration.

Is notarized Home Rent agreement is sufficient.

Please Help.