Unable to Withdraw

At first there was a customer service who induced me to invest, saying that the investment is safe and can be highly rewarded, simple to operate and return in short time. Then, after I deposited, there was a programmer who guided me to buy long and buy short. In the middle, he said that he encountered big data and my funds were not enough, which made me lose my money. In order to get back the money, I added money. Later, I did see that the money in the account was back, but I could not withdraw the money. The customer service said that 15% of the account needs to be recharged to prove that it is my account. This is just a step-by-step trick, a ring of fraud to swindle my money.