I disagree 100%.
Memorialization is your friend, particularly in a case like this. Telephonic discourse offers none, unless you are taping it...and that is illegal in most states w/o advance notification (and approval). Do whatever you're going to do in writing, and keep the paper trail.
As a side not, I've received some satisfaction w/ BB (on a less than perfect transaction), but then, I know which buttons to push, and I have tenacity like a Catholic nun.