Human nature being what it is, when {say it in a nasal voice} "Golf-Kilo-November-Oscar-Braaaavoooh" is relating their entire route and lunch plans, would they possibly not just keep talking in the hope you'll realise your "mistake" and stop transmitting?
Would keying morse S-O-S on the PTT be likely to get a more immediate stop response even from them? It would only take about 3 secs max, then straight into Mayday-Mayday-Mayday?
Just a low hour pilot thinking out loud ...