Unable to withdraw

I made a mistake in entering the withdrawal account on the platform and asked me to pay a margin of 90,000. After a day, I was asked to pay a risk fee of 90,000 yuan.
And it transferred my case to a third party bank.
The bank asked me to pay 200,000 as a transaction circulation, and then said that I had to pay 250,000 as a risk fund with the platform, and then said that the platform has no transaction with me. This 250,000 is for me to bear a total of 500,000.