Demand to file tax return?

I just registered a business for the first time on the 14th of this month, and I just opened a letter from the IRS mailed with my companies name on it demanding unfiled quarterly tax returns from 2010. How do I owe back taxes when the business did not even exist at this time? I am going to call them in the morning but I just want to hear your opinions. (If it matters, im the sole employee, its an LLC, and I do online sales with Amazon and Ebay). Any ideas would be great. Thanks!