I sent an email to Servicehelpna @ teslamotors.com on 8/18 requesting clarification as to why I received the letter (again, I have only used my local supercharger once, but have been on a number of cross country trips in the last year and have visited more than 40 unique superchargers). I have yet to hear back.
I do have an excellent relationship with my local service center and mentioned the email to them. My SA assured me that I did not match the qualifications of the intent of the letter. But still, this letter came from corporate - a clarification from corporate would be nice (I am assuming that local SA had no idea I was a recipient until I told him). I do worry that I have been 'flagged' in some way - I would like my record expunged.