Al,
The whole point is that one is an informal email & the other is the formal terms & conditions. It's impossible to compare the two, as they are completely different.
You wouldn't write an initial friendly email requesting payment for a cancelled gig using the same kind of wording as that on your terms & conditions...
...and you wouldn't write your terms & conditions using the same kind of wording that you'd use on an initial friendly email that you'd send to a client.
Therefore, the advice I gave on one would not apply to the other, and vice versa...so there was no contradiction whatsoever in my what I was saying. It would only be a contradiction if I was giving different advice about the SAME THING...which I wasn't.