Source: https://en.m.wikipedia.org/wiki/Legality_of_bitcoin_by_country_or_territory
Also no any banks can provide financial service to bitcoin exchanges or related businesses, so how you guys are operating there.
Have you seen volumes on Localbitcoins?
how do the people buy and sell BTC there?
Buyer simply transfers money from his account to sellers account and seller releases the BTC from his Localbitcoin account. Bank doesn't know why this money was transferred.
same way, Bitzee provides bank account where you can transfer the money and you'll get BTC in return. Bank never knows for what reason the money is transferred.