Every upgrade and every downgrade is pro-rated, whatever your billing period. You pay, or you are credited, only the difference for the days you have not used yet.
The unused part of the period you already paid for is what the arithmetic is based on.
01 · How to upgrade or downgrade
Sign in to your account
Open the pricing page
opensolr.com/pricing, also under Billing › Upgrade in the Control Panel.
Choose your new resources
Use the customization dropdowns to pick indexes, disk size, bandwidth and the rest.
Confirm, then wait five to ten minutes
That is how long the change takes to be live. There is nothing else to do afterwards.
02 · Pro-rated billing
You are charged or credited only for the remaining days of your existing plan that have not been used. This also covers the case where a recurring payment was rejected and you decide to place a new order instead of simply updating your billing details. If that is where you are, start with your Payment Profile and card.
03 · Refund policy
Money back: New Accounts only
A New Account that cancels its paid plan inside the money-back window gets every payment back, to the card it paid with, and no credit is kept. Who counts as a New Account, and how long the window is: section 8 of the Terms and Conditions.
Every other cancellation: credit, not money
No money is refunded. The unused part of your current period becomes account credit, taken off your next payment. Credit cannot be exchanged for cash.
Where to cancel
Billing › Cancel Plan. The message you confirm says exactly what happens to the money for your account: Change or cancel your plan.
A charge that looks wrong
Write to support@opensolr.com before opening a dispute with your bank. It is faster for both of us.