What you mean by smaller? I have already in pending one bigger withdrawal for 17 days and smaller for a 5-7 days as well.
Why have't you bothered opening a scam accusation yet? If they aren't giving you the service as expected, you are free to open a scam accusation to warn others about their service.If they can accept high volume deposits, they shouldn't have any problems processing withdrawals for the same.
If you think you have given them sufficient time and haven't got a convincing reply yet, please open a scam accusation.