Things They Should Invent: contact method prioritization chart

All businesses should have a page on their website that lists in priority the best/most effective way to contact them for any given transaction (i.e. should I do it through the web site, or call them, or come in in person?)

I'm sick and tired of choosing the method that's most convenient for me only to be told that I have to do another method anyway, or it would have been way faster if I'd done another method, or having employees react to me like "WTF did you do that for?"