Thank you for your post and welcome to the forums!
This is a strange one, and I am a little confused as to what has happened here. There could be a couple of reasons why; The text that states it has been refreshed could have been sent at a later time, meaning the account could have been used before getting that text.
All data relating to usage of the SIM can be found on your online account at any time, is there anything on there?
Can I ask if this is still the same, and have you had any contact with our team regarding this?