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It is probable that some systemkoin insider is maybe stealing, and not the exchange, maybe is their support involved in this and the owners are not aware, i am just speculating in this.
whatever it is all of you scammed from Systemkoin need to hire a lawyer and report to the Turkish government responsible for criminal. It is no excused for owners if they dont know by now about these thefts, they will find out from the prosecution. Also as I know, Turkish is not like some offshore countries, I think they are more efficient. Nevertheless, a high probability that the funds were lost and will not be returned to the original owner.
Internal thefts are not rare, but likely not involving customers in most cases. This situation still remains unambiguous - the exchange is responsible for this incident and have to restore losses to customer regardless of their internal proceedings.