heheheheh........I too had such experiences before. The "pro" thinks we have to kowtow to them as they are in RC longer than Jack. Sorry mate, it dont work that way.
This is what I do usually, occasionally turn on your transmitter and see who screams, no one screams you 're safe.
Alternatively, go get those rare freq which will most probably cost a bomb
DSM gives me peace of mind everytime
....worth every cent.