adsense pincode received but my account disable - do you have similar problem

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10am when i wake up today and i was surprised when i open the door and i saw an envelope from adsense containing the pincode, i supposed to enter the code to verify payment but unfortunately they already disable my account since may 04. it was end of april when i reached payout from adsense but they disable my account as according to them due to invalid click and etc. and so my question, why they still send me the pincode and i was also wonder why they disable my account at the end of the month even though i reached my payout few weeks before the end of the month. i tried to send a complaint now to enable my account though a lot says of not to expect as theres a lot of case like this already that adsense disable account once they reached payout. whatever it is then ill just wait for their response to my complaint. is theres anyone of you also have problem with adsense when you reached payout.