Received a solitary chime before the line went dead, and interestingly enough, I had a knock-on effect from a very similar number just a day prior (3rd August), which wrapped up with '1419' instead of '7619'. It seems to be indicative of the same sort of calling operation. What's more, that '1419' number has already been flagged by others as a nuisance caller. Quite suspicious, if you ask me!