I feel your pain, and also, this is a bad omen for me. This Venue 8 Android is my first Dell purchase ever. I had heard Dell had reasonable tech support and customer service, which is one reason I bought the Venue. I had a similar situation as you report with another highly known Korean manufacturer, and won't buy their products again. I thought Dell would be better, since it is US based... but maybe not. Sorry to hear that or your story.
You might want to look to a private repair service. They may be able top replace the screen surface, if that's the problem and not the whole LED screen behind it being broken). They should be able to order the part from Dell, but I don't know what part + labor will be and if it is worth it.
By the way, can you tell if the screen surface is glass or plastic?
Good luck with your tablet.