I called back number (07) 5634 4024 it says number has been disconnected

They hang up when you answer. Obviously a call centre judging by the background noise.

Have called me several time but can't get hold after calling them back comes of all operator busy at the moment...

This person called me and wanted my post code?
Who is it?

All numbers starting with 07-5634 xxxx are dodgy nuisance callers. Don't answer! :P

called at 5.10pm wst left no msg.when i called back was told all operators were busy and to call back, then a message sounded to leave a message and hang up or press the pound key??