A host priced at zero often sits on a hostname you do not control, shows someone else's banner, or disappears without a backup you can download. The cheap plans here are not free. They are priced so the term, the disk and the refund window can be written down.
Basic at ₹149 a month, or ₹1,188 for a year, is the smallest published figure. The ₹99 a month line on the yearly plan is ₹1,188 divided by 12. It is not a monthly product at ₹99. The page web-hosting-99-rupees.html repeats that arithmetic so it is not a surprise on the invoice.
Free mail next to a new domain is a common reason messages land in spam. Set the domain's mail records only after you know where mail is hosted, and send a test to an outside mailbox before you announce the address.
If a zero-price offer appears in a ticket reply, treat it as a mistake unless the price list on this site says zero. The price list does not say zero.