It looks like you and DS will have to agree to disagree then.
I recall in a past life being told by a chap that he was "dead certain" his property was being 'buzzed' by his girlfriend's ex-husband. The 'ex' was allegedly a pilot who flew out of a local airfield. We explained to the chap that it would be much easier to identify the culprit if he could tell us the aircraft rego. The chap eagerly undertook to take the rego down the next time the problem occurred. The chap subsequently and eagerly reported the rego of the aircraft that was buzzing him. He was "dead certain" about the rego. Problem was that the rego he reported was all numbers ......
My recollection of DS's domestic flights is that he always takes someone along to do the radio calls and witness what happens, because somebody's always alleging he's said or done something that he didn't do or say .....