When you purchase an upgrade it can take up to 24h until your instance applies the upgrade to your subscription automatically.
You can speed things up by pressing the reload button in your 3CX Management Console.
In case your purchased upgrade includes also a bigger hosting instance, the change will be performed outside of the regular office hours 8 am to 8 pm within your local time zone to avoid interruption of the service. If you wish to be upgraded instantly (expect a downtime of 15 minutes), contact our cloud team to do so via email@example.com. With the upgrade, the quota levels will be adjusted if applicable.