That is true yes... Well they replied to me again, so I do expect them to join in this issue here soon. And I am still waiting for the site that has the dogecoin address, they've been a big help also and very understanding.
Thank you all so much again...
You have to understand that you might no be able to get the private key from that doge address. If the website uses could storage that would be risky and costly to them to fice you that private key.
Once they insert the information to get the private key the wallet might get compromised, so it's pretty reasonable for them to refuse to give you that private key, specially for a relatively small value.