I do warranty repair on tv's occasionally, and i can tell you this.
If you ever have to have that TV repaired, they are gonna send a repair guy out there. That repair guy will inspect the TV for damage before attempting his repair. If he notices that dent, that could be a problem and may stop you from getting free warranty repair. Also, taking off the cover to smooth those dents will void your warranty. Something you do not want to do.
I suggest either call the manufacturer, and have these dents well documented, save all conversations you have with them and put them up for safe keeping. Also call Pauls, or where-ever you bought it, and ask for a gift certificate or some cash back for compensation. otherwise......
Take the TV Set back, and get a new one, as long as your within 30 days of the purchase date, the retailer should take it back no questions asked.