Aww so bad. 3500USD is a big amount of money. When is the last you opened your mew account ? Maybe your a victim of a phishing site. Did you check if you go to the right address? There are so many fake websites now. Look very same to its original one but if you check the link its different. You know ethdelta ? An exchanger. It has an imitation ederdelta. So be very careful. Instead of opening your account when you just want to check you balance. Just go to ethplorer or etherscan.io. Also, be careful of submitting your address. Check if this is really the address and not the private key.