Hey,
Just bought some coins via coinbase website and now I saw that I can't move the coins because its locked for 15 days. my account is fully verified with docs.
Is there any way to speed up things and unlock the coins?
Coinbase has had a history with account suspensions and stuff like that. I've never heard of anyone getting their coins locked for 15 days, though.
It could be because of the fact that you paid with bank transfer. That seems like the likely answer for now. You should still contact support to clarify why exactly this has happened, however. I don't think that any other service holds customer funds for this long.
In the future, I would not recommend coinbase as an exchange or as a wallet. You're likely not going to get the best rates, you don't hold your own private key when holding funds on their platform, and previously they have frozen accounts that have simply been suspected of dealing with gambling websites. Essentially, you don't have full control over your coins, which is the point of BTC. Their support is also pretty terrible all throughout 2017. There are plenty of other exchanges, as well as wallets, that are available.