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Rule to call CSC(learn by experience)
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0. You have to plan to spend your time at least 1~3 hours
1. Use the redial button until it get thru.(at least 50 ~ 100 times try, I AM NOT KIDDING !)
2. Avoid Monday.(It is very very hard to reach IIO)
3. Show your deperate feeling to IIO, it would help for getting more information.