Not the person you're replying to, but I'd be interested in suggestions - I've in the past had some horrendous support experiences.
Also my feeling on reading the grandparent comment is that they don't care about improving the support structure of the company, but rather find that bothering a C-level is the fastest way to get somebody important to send a "just get this sorted so this person stops bothering me" e-mail & have their support issue resolved - which I have to say I'm sympathetic to... whatever works for a customer to get their issue resolved, they have no interest in helping or hurting the support team.