6% service fee will be charged when you withdraw money if you haven’t trade after you deposit fund

I was induced by the customer service to deposit $150.Since the merest trade need 0.1 lot,so I haven’t trade because of insufficient margin.Today,I applied for the withdrawal.The customer service tole me that another 6% service fee will be charged since I haven’t operated in my account.I have never heard about this.It is a rip off.