Auto shop car lifts body dents

Recently I had to take my car to the shop to have new front springs put on it. When I picked my car up from the shop and got it home I wasnt happy. On 3 out of the 4 corners on the roof of my car around my sunroof/moonroof there are now dents very noticable ones especially being black. They WERE NOT THERE when I dropped the car off. The shop is saying theres NO WAY this happen there. But what I wondering is if they put my car on the lift wrong could it make it buckle ( I guess is the word to use ) in certain areas? I hope I worded this right for you to understand what Im talking about. Please e-mail me back ASAP. Thank you Nicole