The ES registry is a very 'funny' one. There renewal system is quite out of the ordinary. It allows users to renew even though the registrar doesn't. In fact, a registrar can't delete a domain at all, perhaps that is why you kept control. We have the same thing going on. Clients asking us to renew, domains that have already expired. We can still renew them weeks after expiration dates, because they haven't been deleted.
Another funny thing, I personally have been emailing with the registry and kept getting messages back that my email was considered spam. I telephoned, mailed, faxed, etc. They told me to send 5 emails instead of one. A little later, they told me that it had to be something in the email content making it appear to be spam. They suggested that it was our signature, perhaps did we have pictures in it? We have a very basic text only signature, so that wasn't the case.
After 1,5 year, somebody at the registry actually took a look and found out: it was their own signature and their own registry logo image that was rejected by the spam filter. Me replying to their email, including their message AND their signature, caused my email to appear to be spam!
I must say, I couldn't help but smile after hearing this.