It does not look like 99 Slot Machines is very receptive to complaints, but here goes:
According to their website,
"Now that I've made a withdrawal request, how long will it take for me to receive my money?
NETeller withdrawals are processed same day! For credit card redemptions, your money is generally credited back to your credit card within two days of making your request. For FedEx/overnight express check withdrawals, you can generally expect approval within 2-3 business days, and depending on international delivery, 3-5 days for arrival. Our general policy is to process your redemption request within 24-72 hours of getting it, assuming it is during normal banking hours. Wire Tranfers are approved within 3-4 days and should arrive within the next 3 days to your bank account. These periods are based upon the assumption that you have sent the required documents or filled out the Player Certification (this last one is for US citizens only)."
So there's really no reason that a withdrawal request that I made on 10/9/13 should be unprocessed...