In version 7.0.4 the message displayed by iMtG after successful iMtG Server unlock can incorrectly state the number of months by which Expiry Date was actually extended. The message should read "You have unlocked iMtG Server access and the Expiry Date was updated accordingly. It is not subject to Restore Purchases so keep it secret, keep it safe (backup your app)." and is fixed in version 7.1.0.