Shared hosting puts several accounts on one machine under limits. It is the right size for a brochure site, a student project, and a shop that is still finding its first orders. It is the wrong size for a private database server or a workload that must not share a CPU.
Unlimited does not change that. The word limits the count of sites and mailboxes under fair use. Disk on that plan is published as 100 GB. A job that crowds out neighbours can be rate-limited under the acceptable-use section of the terms.
When the site outgrows the plan, the exchange policy allows one move to a larger shared plan during the term, with the price difference invoiced. It does not describe a private server, because none is on the price list. Do not order Unlimited expecting a machine of your own.
Prices stay in INR. Basic monthly is ₹149. The three-year equivalent of ₹49 a month is ₹1,764 billed for the term, not ₹49 taken each month.