The client trade normally, but the profit was dudected and unable to withdraw

Without any notice, the platform erase the profit generated by the customer's transaction, suspend the account transaction, close the background, without explaining anything, just unilaterally say that it is violating the transaction, and there is no evidence! The customer is really just trading normally and making a profit normally. Do we have to keep losing money and can't make a profit? The platform deducts profits without authorization and does not withdraw money