Only Method left is Offline maybe via Branch, Almost all IndusInd Cards are LTF so no worries. IndusInd is one of the shittiest bank out there in terms of technology user interface customer support etc, as you’re already saying online method failed try again after 6 months(assuming your previous application is 1st time) then go for low end cards like Aura Edge or Rupay Card. Gradually based on your usage they’ll offer upgrades. Here main problem is for most the times even after rejection indusind sometimes keeps the application intact, so it won’t let apply for new card by saying “already application exists”. So if you’re lucky enough you won’t face this problem & as said earlier wait 6 months then apply. If you already done multiple applications then maybe branch is the option. Also Try to reduce Number of applications in year, increased credit enquiries may make you see as credit hungry & it’s bad for you. So don’t apply for cards frequently.