Please Help

Hello, I was looking at my stocks on my computer and all of the sudden, I started getting notifications saying that my order to sell my stocks was completed. All of my stocks in 6 different companies got sold while I'am watching it happen. Then a withdraw of all the funds after my stocks were sold was initiated. Now all of my money that I was investing to pay for my next semester is being stolen and I can't do anything. I can't cancel the withdraw and now it's in pending. I don't know what to do now, I'am literately crying. Please help, what should I do?. I reported that my account was compromised 6 times to costumer services and their is no phone number to contact them and I changed my password.