This is the problem with letting 'amateurs' loose on the radio. I would question whether the radio operator concerned even has a Certificate of Competence; I'm sure none of the people I've examined for them would not normally act like this.
Many people are STILL under the mistaken impression an FRTOL permits you to do A/G which it doesn't, you must still take the exam with an authorised examiner, and those holding FISO (Aerodrome) or ATC Licences with ADV/ADI ratings must still hold an A/G C of C also, usually by just applying and giving your licence number. Regretfully the issue of the AGCS Certificate of Competence is no longer free; wef last October it wil cost you (£35 I think).