Based on their terms about withdrawal of funds, they say:
11.1. Due to the workflow of our anti-fraud system, the waiting time for your withdrawal can be prolonged up to the point when all the needed procedures will be conducted to supply a decent level of financial security for users (up to seven (7) days and more if needed).
It is written up to 7 days so you need to wait for more days, maybe they do manual verification for all withdrawals and yours is on the queue.
I tried to find if there is a wagering requirement on deposit without bonus but I did not find it, did you place a single bet only then requested withdrawal?
Usually casinos has 1x wagering requirement on deposit without bonus to avoid money laundering, so if you withdraw after 1 bet only then it can arise a warning to their system to do manual check/verification.
Their terms are clear that Withdrawal Request will be approved and proceeded with waiting time is up to 7 days. The user will have about 6 more days of waiting, in maximum, before he can get final approval result from the Airbet company.
If their Anti-fraud and AML checking result on this account is good, they will proceed the withdrawal for him. If not, the user will come back with his update on this case as a negative comment against Airbet team. For now, it's only waiting is helpful, but I understand that waiting for like 7 days is a long time, and it's uncomfortable experience.