I'm very sorry to hear that your products weren't as you expected. Unfortunately, I don't seem to have any other communication from you. How did you attempt to contact me? Maybe there's a problem with the messaging system in the website and we need to bring that to the shapeways support staff. I can certainly understand how frustrating it can be to not get any responses.
The "grey" problem is a known issue with the sandstone and I compare the two in the video. I'll also add a comparison still picture to make that more clear above. If your model is even lighter than shown in the video, that's something that I'd appreciate seeing photos of to see how bad it is. I'm hoping that the new full-color plastic will have much better colors than the sandstone does, but it is still in beta.
The "missing white ring" is how the plastic models are shipped, you need to paint them yourself as described in the video. I apologize that that wasn't clear from the description. I'll add a photo of the plastic model before painting to make it clearer that this is how they arrive to you from shapeways.
If it would help, you could ship me the plastic models and I'll paint the rings on for you. I'm certainly not the best painter, but I've done about 6 of them so far so they come out OK.