CarMax wants to buy my car back

Don’t know what to do. Went to CarMax I bought a car from them two months ago was just checking out cars today (don’t ask why) and got this car appraised and the managers came out and said my car has been totaled before it wasn’t on the CARFAX and they want to buy my car back. They said they are sorry and wouldn’t ever sell this car to anyone again. What do I do??? I can’t afford rn to go through another pre approval check and everything