It seems there is no straight forward fix way to update add on mobile number. I request to those who were successful, please create seperate post depicting all the points because for some the signed form via email worked and for some signed form sent to Chennai also didn't work or misfired.
Better take add-on card. Quite easy to get add-on and currently you will get ₹500 amazon GC for a new SBI Card add-on. The campaign may have some T&C, please refer that.
I am in same boat. Bought at late night but still not delivered. Usually it shows in "My Orders" section as processing/pending but that's also not shown. Let's wait for 24 hours.
Are you looking for online vouchers? They are available on nearbuy and magicpin (now OOS)
https://www.nearbuy.com/online/manyavar-e-gift-card-karnataka/gift-cards
https://magicpin.in/Manyavar-offers/110432/
https://giftkard.in/product/manyavar-gift-voucher/
The millennia is at highest level in terms of cashback cards from HDFC pack. Tata neu Infinity can be above millennia but the cashback is limited to tata neu ecosystem unlike millennia's statement credit.
FYI, I hold millennia, tata neu infinity, axis fk and sbi cashback. Except SBI CB, all are...