Air India — Refund

As the flight has cancelled due to covid the air india issue the voucher of full refund.The airline issue full refund in this voucher number 07045347 .
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etickets number :[protected]
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these are five e -tickets
As I mentioned that i have voucher of full refund but i didnot receive the full refund and i didnot receive the partial refund also in my account.