Induced to participate in the NYFX anniversary rebate event, but can't make a withdrawal before the completion

A netizen I have known online asked for a deposit, and claimed that there was a rebate event for the SSHGTT anniversary. A deposit of 200,000 USDT will get 8888 as a gift. I received the email from the platform on August 7 and immediately felt I had been cheated (I hadn't deposited yet but the rebate was immediately recharged to my account). On 8/7, before the rebate arrived, I immediately informed the platform's customer service to cancel. But they replied that they do not allow cancellation. The account will be locked and can't made withdrawals on 8/7. If the user fails to complete the activity, a legal platform may only disqualify the user and deduct the profits or bonuses generated by the activity, but will not deny the principal.