You're right in saying their customer service was terrible. ..Email support was always about 2 days for a reply, even then it seemed as if they only half read your email!
Thanks for contacting 666BET support.
We have received your message. Due to increased customer enquiries, please allow 7 days for a response.
(received today)
In reality, they should be saying 1 Day instead of the normal 2 as 90% of these requests will be asking the same thing: "where the f**k is my money?". There certainly won't be any game or bonus related issues to deal with. Must be the easiest their support ever had it.