i answered the call and an immediate hang up this is on a publuic holiday

rings, I answer it but no reply.

rings, i answer it, line opens but no response. They didn't cal back (well at least not in the last 5 mins).

Answered call and they/it hangs up. Called the number and it's disconnected. I suspect it's a spammer that is now added to my phone's blacklist and also to this site. If they call again my smart phone will still answer it and hang up so they are charged for the call. Have a nice day spammer! LOL!