No, Selro doesn’t automatically upgrade the subscription if you go over the order limit in one month (e.g. during Xmas sales). We monitor for two months, and if the number of orders is continuously exceeding the limit, we will let you know and move to the next tier.
If you are moved to the higher tier and your order total decreases please contact our support team at support@selro.com and they will review your account and subscription package accordingly.