IS MYETHERWALLET.COM SAFE

Hello,
I participated in an ICO before Christmas and created a wallet at Myetherwallet for the coin. On 28.12 I go into my wallet and have to watch how all coins from my wallet are sent to an address. So all gone. Then I followed the address via etherscan. I noticed that on the 29th and 30th 12 a huge amount of many different coins from many different addresses, all to the same address where my coins disappeared, were sent. Only on the 2 days worth several hundred thousand US $. In the following days until today not so many transactions are made at this address, but over and over again. I would not notice or would not interest me if not exactly to this address my stolen tokens would have gone. Obviously someone on myetherwallet.com is up to mischief. I sent the recipient's address and multiple sender addresses to support, but nothing happens.
Oh yes, my key was kept safe, not on the PC.
However, I still expected from a customer to whom I sold something, a small amount of ETH Zurich and when I opened the wallet to see if I had already arrived,
I was called out of the office and left the wallet open. When I came back after about 10 minutes and looked at the screen, only a small amount of the tokens were there, but they disappeared after a few minutes. I think that I left the wallet open was the big mistake. I just do not understand why the support does nothing, there are still Coins sent from different addresses to this address.
My PC is constantly checked by a security company, except that runs the full program of Kaspersky around the clock. I think they have hackers waiting for someone to enter his key and open his wallet.