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Remind them regularly of any unresolved issues and they will eventually resolve it. Bitstamp has been around for nearly a decade and they are one of the very few exchanges licensed to operate legally. They have an almost bank-like status in the EU.
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I agree that Bitstamp is one of the best exchanges (alongside of Gemini). However, your last statement might be
a bit of a stretch. Bitstamp claimed to be licensed in Luxemburg for years but has recently scrapped the reference
from their homepage, which at least indicates that their license has not been granted yet.
Personally, I have used Bitstamp for several years and never had any problem and would really recommend them.
Especially, because they take security very seriously and the last time they were hacked no customer had to take
a haircut and since then they have increased their security measures even more, which might partly be responsible
for the issues that some of the people in this thread are facing.