withdrawal restriction

I have invested in Elio International since October without a problem. I now needed to withdraw the return on my investment and have discovered what everyone else knows; that Elio International is a fraudulent broker. It took over 3 weeks to get the external account validated, then I asked for some of the funds to be transferred to me, shockingly I received an email notifying me that my request for withdrawal has been approved but no transfer took place. I immediately submitted a complaint to fintrack /org and made a phone call to Elio International a few minutes later where they confirmed my request was received and would be processed in one to two days. The request would still have been pending till now, but the complaint I submitted got me a refund. I kept thinking to myself Why does a request for withdrawal need to be processed for so long? It should be almost automatic and should be in the external bank account or wallet the same day or at most the next day. How can a firm justify such outdated practices?