Pretty obvious, no?
With all due respect Max but if I take the OP's records, and those are only ones that we have seen, there were never more than 5 working days in between communications. And they in fact confirmed on 27th July 2016 that it was all verified only to ask a few hours later for a bank statement. I would think the OP has prove of that!
On the other hand, i think the repeated demand for a bank statement was unjustified especially after the OP provided a signed and stamped confirmation letter from his bank.
Maybe I am all wrong in this, but considering the information I have seen so far the OP has done nothing wrong. It is not his fault if Inetbet need days to answer to an email.
And why did they refuse to pay to Neteller as requested by the OP and which was the source of the deposited funds??? That does not sound right either!