I've had this problem before as well. The way I've handled it in the past is to just keep sending cards to Newport Beach until they finally call you and tell you to renew.
Keep logging into your pop report and when you cannot do so your membership is expired. They did send me a letter about 2 weeks ago saying mine was about to expire. I believe mine expires next week sometime.
You should try to go to the online SMR and the population report I belive and if it allows you to view it then your still a member. A better way is to view your PSA grading history, if you ever graded cards that is, and you will be able to go to your first submission to see the date, because you most likely got your cards graded around the same time as you joined so that should work. Of course the best way would be to simply call, but try those other two things too.
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Hope that helped
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