Your withdrawal may be unsuccessful likely because:
1) Invalid bank details entered (a common mistake is entering your bank card number; the bank account number is required)
2) Withdrawal contains some Cashback amount that was not earned by the user (withdraw more than what is available in available balance)
None of the above is the case? Contact our customer service team via email (firstname.lastname@example.org) or live chat agents here and we would be glad to assist you further.