Bajaj Finserv — Gift voucher fraud in consumer loan

This is Saiprasad Vandanapu (Mobile number : [protected]). I have taken a consumer loan (4000CDGW289815) from Bajaj finserv to purchase a TV. Bajaj has offered and issued gift vouchers of worth 8000 rupees. I am able to redeem 4000 but for the other 4000 rupees, it is showing that I have already redeemed but I did not redeem actually.
I have raised 2 service requests with Bajaj finserv about this fraud but they are simply closed without resolving the issue. This seems to be a deliberate fraud and cheating Bajaj finserv.
Please help in resolving this issue ASAP.