Those messages are a part of the "immersion" factor in the game and are thus not relevant to your situation. They are simply "ear candy" to help break up the monotony of your patrol.
I use a mod called "WB's mission orders lite" to eliminate them. That way, the only radio messages I receive are actually relevant to me in the game, such as an order from BdU to intercept a convoy leaving Gibraltar for Malta or the British convoys taking troops to Norway in 1940. Many new players are confused by the immersion messages, so don't feel badly that you got suckered by them.
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