What has happend to British manners?

I am frankly puzzled why some people have no manners. The world would be a much better place if we all practised being polite and being honest. Time and time again, I meet people who do not have the decency to respond politely to me. For instance, at work we have a radio comminication system that you can set for each individual Station. It is easy to accidentally switch the channel from your own Station to another one. When I hear someone request information on my Station channel, and know it isn't one of my staff, I politely let them know they are broadcasting on my Station, and they should check which channel they are on. What I would like to happen is the person to radio back and say thank you. What normally happens is dead silence! It's as if they are embarrassed to acknowledge they have heard me!

Another annoying habit people have is their way avoiding having to say no! I arranged to see someone today. As common courtesy, I phoned them an hour before I am due to be there to see if it is still convenient. Their first reaction is, "Sorry, I can't hear you, you're breaking up." Then the line goes dead. When I ring back again, they pick the phone up, as soon as I speak, they put the phone down on me. When I phone a third time, their answer phone is switched on! And all I was trying to do was confirm it was OK to go and see them! How difficult would it have been for them to say "no!".