Unfortunately this is not possible to fix.
The lcd screen (panel) cannot be repaired.
The entire lcd panel would have to be replaced, which is virtually never feasible. Vizio screens are nearly impossible to find in the first place, but even if you could the cost of parts and labor would be more than the tv is worth. It would be cheaper to buy a new tv.
Now, you could still try calling vizio, or even trying to deal with the retailer if within their return policy. However both would be expected to deny any coverage or responsibility in the case of physical damage caused by the user. If you tell them what happened, they would not cover it. It wouldn't hurt to check how it was purchased though, if bought on a credit card they often have some type of accidental damage protection that may cover this.
Otherwise, in this instance, you'd be better off buying a new tv. While unfortunate, this may be an opportunity to buy a better quality tv as well, the vizio tvs are very low quality and short lived, and even if this issue had not happened, it would have likely only lasted a few years at best.
I recommend sticking to the name brands, which tend to be the most reliable, such as Panasonic, Samsung, LG. The “off brand” sets just aren’t worth the savings, they have high failure rates and are poorly supported if parts/repairs are ever needed. Example: http://amzn.to/2ckLIJg
If you happen to be a costco member (or know someone who is) I'd suggest buying it there. They tend to have very good pricing to begin with, but will also double the factory warranty to 2 years instead of 1, and they have a square trade extended warranty you can buy up to an extra 5 years for $50 or so which is well worth it. Wherever you buy, I'd highly recommend the square trade warranty (the "store brand" warranties aren't worth the paper they’re printed on). You can get that here, no matter where you buy the tv: http://bit.ly/1fDPJ99
As a side note, I would not personally bother with a "smart" tv. You'll pay a premium for those features which end up being slow and glitchy and aren't well supported. By contrast you can spend $30-100 on a roku, roku4k, fire tv, htpc or smart bluray player and get all the same functions and many more, with better performance and lower cost.
Best regards, ***** ***** for the news,