Pretty much the same thing happened to me with Bittrex. I had an account with funds and then suddenly and without prior notice, they decided to ask everyone for documents. Either way, I suggest posting in their thread on the forums or contact the support.
But mobnepal's issue is worse. He cannot verify his account if he wanted to because his country is not included in Bitpanda's list of allowed countries lol.
Having that said, many cryptocurrency services are not ready for full KYC/AML compliance. Leave the small services if you ask me.