I smell a rat here. I would be very surprised if the CAA Enforcement caller was genuine. He should have been told to put his point in writing and you should then have told him that the conversation was concluded.
It sounds very much as though someone who knows you and that you fly aerobatics was impersonating the CAA. Did you take the name of the caller? If so, write to the CAA and ask for an explanation, stating that they have the 10 working days of their charter to respond.