HDFC smart buy query

Hello All,

I have a small query regarding HDFC smartybuy cashback offer. the 10x reward points are renewed on the basis of calendar month or on the basis of credit card bill. for eg if my credit card bill is generated on 15th jan so would i get 10x for purchase done on the statement period, i.e 15 dec – 15th January or calendar month, i.e from 1st to 31st January?

Thanks in advance