north carolina law concerning purchases?

What is the name of your state? North Carolina

i want to know if it is a law in the state of north carolina that gives you 3 days to decide whether you want to keep a purchase or you can return it for a full refund. does anyone know?

Depends on what, when, where and why you made the purchase. How about a little more info?

i was referring to the purchase of a used vehicle. after buying the vehicle from a dealer, we realized that they had not lived up to the requirements we had asked before the purchase. in fact, they lied about one service being done. what are our options, if any?

Question 2, are any of the requirements or the missing service part of your purchase contract? If the answer is yes, see a local attorney. If the answer is no, Google the phrase "caveat emptor". It appears you have a case of buyer's remorse which is generally not a reason to invalidate a purchase.