does this sentence make sense? I hope the cargo will reach your's soon? Is there any other expression of this sentence?

what's wrong with this britishman? Last time, I was talking with one britishman on the phone. he mentioned another man and I had knowledge of him. so, I responded"yes, I know him". but this britishman is irritated and hung up on me. I am confused and don't know why.Someone tells me if I say "I know" to others that means I am bored listening, right? but I just want to express the information "I know something or someone". so, what should I say?