They've been given a reprimand for it:

http://www.bbc.co.uk/sport/0/formula1/22999260

Reading through all that it seems that it was a mess all round, which is why the FIA and Pirelli are also picking up the costs of holding the tribunal. Slap on the wrist for Charlie Whiting for wrongly telling Mercedes it was ok! Also, not sure why Hamilton could have banned from the championship and Rosberg allowed to continue given both drivers took part in the testing?
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