I'm having the same issue.For the past 2 days cannot log my main avy into SL. I can log in my alt but no luck with my main avy . Wont even start to download most annoying !
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I recieved the same email , didn't take any notice as I thought it was a scam , but then i couldn't buy any Linden after the 9th ..still cant so thought that i had better update with same credit card details , still cant buy linden .
I have been told to update my card details also , added a new card & still cannot purchase Lindens this is really annoying been trying for over one week .