I have no idea what full screen screenshots are supposed to mean, I guess just make them as clear as possible and as big as possible.
Usually, this questioning process will take a long time and they'll keep coming back with more questions as they just shamelessly hold your funds. I mean, that's literally how HitBTC operates and there is nothing you can do about that.
Just be as specific and clear as possible, if you got your tokens from an ICO sale, then make sure you include all screenshots that can even remotely relate to the token. But HitBTC doing this for just 7 ETH should be alarming for people who like anonymity.
We cant do nothing but to be stuck into those times where we do just wait up and get pissed of because we are depending and waiting for their reply.This is really alarming because 7 ETH doesnt really like to be so big which would really require KYC.If they are too strict when it comes to their compliance then sooner later i wont be surprised that this exchange would go down.
I remember one user posted about this KYC/AML of HitBTC and it seems to be an endless questioning. Explain it in detail to them + screenshots (I suggest you to provide the full display). They will surely insist to know the origin of the funds. I will not be surprised if they even asked you where did you get the 3ETH you used to invest in BANCA ico pool.
Possibilities are there and they would really ask such thing where you do get those 3 ETH that you had invested as long the case isnt resolved expect further questions would be asked.