Bajaj Finserv — Voucher not getting validated

Dth voucher code for rs.2200 is showing as invalid

Secondly we have redeemed the electricity voucher no. Diure2p2apv5624 on the bajaj finserv wallet and had got a message that we will get the cashback of rs.2200 in the wallet within 48 hours after the payment. We had made the electricity payment on april 8 from the bajaj finserv wallet and applied the voucher for which we recd the message that you will receive the cashback but till date not received the cash back