All these comments about phone issues.....spot on.
Which is why I have cultivated an "email only" relationship with my clients. Obviously there are scenarios where a phone is necessary. But they all know they will never get anyone live when they call.....and I am usually fairly prompt on returning emails. And thorough with my responses.
In order to make this work I try to be very pro-active on any issues I foresee so we don't have any urgent situations where people think a phone call will be needed.
I realize this isn't possible for many - but I own my own business and as such have certain advantages...