When I email back asking why they pulled one of my responses, they usually respond.
Your experience is not unique, and the answers and understanding of the issues varies widely depending upon whom answers.
When I send an email directly to CS (not a response to one of their emails), it seems about 1 out of 3 get answered.
The form emails I understand - I can only imagine how many times they get asked the same questions.
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Reading Talkstotrees - I just remembered one funny instance. I couldn't find the link to take me off the email list, and had seen several other members ask and the answer was to email CS. Sure enough, the "contact us" link had a pull down menu that included something like "remove from email list" - so I emailed.
Rofl - I get an email back from one of the CS staff that offered (yes, OFFERED) to close my account. Classy.