PayPal Act Like Interpol

I have been using paypal for many years mostly buying from ebay, recently I started selling mobile software, I provided to paypal everything asked (ID copy,proof of address etc) but suddenly they have blocked my account asking for new proof documents not older than 6 months! what should I do? have a new passport or a new driving license just because paypal askde for it! they have gone too far, they act like they are Interpol and not some private company and with what right they have blocked my money in my paypal account?

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