My poor speaking voice really frustrates me. On the phone I say, to me it is clearly, that my wife is out and "please ring after 2". Then the caller says, "when shall I call?". Darn it, I just told you, but you clearly did not hear me!
The problem is at my end - either I speak too fast or not clearly enough to be understood. It really does cause so much confusion and frustration. Stroke! I have to learn to speak much slower and much more clearly.