[eljot88]

How? I have to let you know before I just send it back
They answered maybe a W?
they told me to give a different secure address so they could send me a new one, otherwise they would send me my money back.
I think they think I'm talking about a DNA?
What should I do, give them a new address or get them to give me a refund?

Give them a new address, accept the replacement and then when the replacements comes return it for a refund.
But you can also write that you don't have another safe address and you prefer a refund, which will be much easier.

I got the W. i told them that the only safe adress is my adress and if that is not woking then on the parcel shop. But i told them i prefer refund because I'm afraid it will happen again. So they send me a Refund. now the money is on the way 

People saying here that steam is patched they have right in some part. Many of my friends failed recently. But as I can see, you are on the good way to get refund.