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Complain and everything as long still on the good manner with saying a bad word still acceptable, I don't think connected any of his experience on another gambling casino to this case will make him clam. Just stay in the topic about Bitvest. Instant withdrawal is one of the important features, almost 95% of casinos mention this feature but sometimes they still need manual transactions and need a couple of days to be processed. In gamble, we really need to deposit and cash out faster, because while you are on a big win we want to avoid gamble more and losing all of the money.
Well, based on the condition while @OP got canceled on the first transaction more than 1 BTC and how much money he was own. If you is him with that such big amount, then you will be panicked as well. For @Chato1977, If you want to keep discuss about your experience feels free to express but without bad word should be fine. Well, you also already got a response from Manager Campaign of Bitvest, let's take some time first.