To be honest, I don't know where to start to examine the case you are talking about. however, regarding gambling a betting shop. it seems, there is a high probability that the person you are talking about knows each other with the betting agent. or, there could be other factors that cause this case to occur. maybe, there was negligence committed by the betting shop operator. because, it would be very unlikely if a betting agent gave credit of up to 8k without knowing that the gambler only had a 1k balance. obviously, this is outside the procedures that apply wherever the casino is. except, there is a conspiracy that the gambler and the betting shop know each other.

By the way, I'm not sure what I'm talking about, because I don't really understand the essence of this matter and what gambling the gambler is actually doing. however, I'm trying to simplify the case related to 1k credit to 8k. from here, we can already see that there is an irregularity going on. so my assumptions as I said in this post.