Export files and the database from the old host, import them in the file manager and database screen, and update the site address if it changed. Point DNS only after the copy loads on a temporary address. The 7-day window still starts when your new plan is confirmed, so start the copy promptly.
Sign in to the client area and keep the order reference nearby. Prices and windows on thedatadynamo.site stay in Indian rupees, with a 7-day cancellation on new hosting orders and no fee return on a domain once it is referenced.
Write the exact error into a support ticket. For mail and DNS, allow up to 48 hours of cache time before treating the change as failed. For a plan that is too small, use an upgrade and pay the difference rather than opening a second overlapping service.