They are just using OKpay bank info for deposits pretty sure, "Mayzeus" is a partner of Okpay and handles their transactions. Both will hold large transactions from 3rd party for all sorts of verification and can take a while but doesn't help if you just get no engrish one word answers
Similar thing happened to me.
Send 10k USD to Okpay. My account was already verified and had sent them a wire before. They switched banks right after I sent. Support told me that the wire would "bounce" and automatically be returned after 30 days. Haven't asked my bank to initiate a trace yet as they they seem reputable enough.