Why does my son's tablet not work at all?

My son won a Tagital T7X Quad Core tablet for highest sales in school during a fund raiser. After having it for about 30 days, it stopped working.

When we try to update anything, it takes us to the Google Play Store and immediately asks if we want to add a Google account. We already have one and when I enter that information, it shows a pop up that says "there was a problem communicating with Google servers. Try again later". No matter how many times I try, I always get the same response.

I've taken it to my local Sprint in the hopes they could help me. They said there is nothing they can do and said to contact the tablet company.

What can I do? My son worked really hard to get this and I only let him play a couple hours a week.