I am taking a guess as to what you or another person was trying to say, but it is an unusual sentence construction. "if you knew what message was being sent to you. You would slam the phone down and never speak to me again" "wait until you receive my message, you will never speak to me again" <-- this is more standard English

It is quite unusual to use simple tenses with conditionals. You should have some tense that has a conditional aspect. I therefore can't think of a situation where this sentence makes sense. More usual forms would be "If you knew the message being transmitted, you would never call me again", or "If you know the message being transmitted, you should never call me again". If you can explain the situation you want to express, we might be able to write the sentence correctly. Otherwise, it is just guesswork.

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This is a bit confusing. Can you try using it in a complete sentence then we can provide you with a better answer