The Game Steward review for Klaviyo: Email Marketing & SMS

Based on our experience, be very careful with Klaviyo billing. Even if you turn plan auto-upgrade OFF, Klaviyo turns ON the auto upgrade in their billing forms if you upgrade via a campaign. With this, Klaviyo will over-ride your selected plan choice, up-charging you 100% more than you agreed or needed in our case. Plus Klaviyo says they have specific policy that they do not provide refunds when you fall into their auto-upgrade bucket. So be careful to look for auto-checked boxes as we found in our experience can double your cost with no benefit and absolutely no refunds.