HDFC Credila is an NBFC ( Non-Banking Financial Company ) i.e. they borrow money either from the banks or from private investors which makes them costlier as compare to nationalized banks. If you have collateral applying at nationalized banks like SBI / BOB is recommended. If you are worried about the delay in processes at nationalized banks, apply via marketplace like GyanDhan. They can even pick up the documents from your home free of cost. They guarantee the loan from nationalized banks in 12 working days.
Coming to interest payment, yes you need to pay either the partial or simple interest during moratorium from NBFCs and even from private banks like Axis and international players like
Prodigy finance. If you don't want to do it, Nationalized banks are the only options.