Oil Change and Inspection

BEWARE!! I had my car serviced here. Before leaving, the Pep Boys employee who handled my payment verbally told me that my car was in good shape and had no other recommendations for maintenance, which seemed reasonable, as it was showing no signs of problems. Following the oil change, I drove home (approximately 3 miles), where the car sat for approximately one hour. I then drove from my home approximately 7 miles where the car engine was stopped for 15-20 minutes. Shortly after starting my vehicle and driving less than 2 more miles, the engine temperature gauge spiked to the maximum and the engine began chugging. I immediately turned the car off and pulled to the side of the road, in an effort to avoid any further damage to my car. Then my car was towed to a more trusted shop across town. When examining my car, the mechanics at a more trusted shop found that the radiator coolant cap was left off the fill neck and was lying on top of the engine. Photos of the cap location were taken once the hood of the vehicle was lifted (cap was not moved by the trusted mechanic); including three images showing the coolant fill neck and the cap. The other photo showed the hood liner wet from the coolant that came out. Due to the short amount of mileage that was driven, the car thankfully became operable once radiator coolant was filled and the cap placed back on. Based on the photos and a licensed mechanic's evaluation of my car, it is apparent that the Pep Boy's mechanic removed the radiator cap from my vehicle and failed to secure it back onto the radiator fill neck. However, the store manager, Jae, informed me that since I drove my car a few miles "it must have vibrated off after service." I may be a female, but I know that the caps have locks, AND that I have 136K miles on this car and no cap has ever "vibrated off" while driving. Thanks for the advice. Really. I sent photos, receipts, and letters to Jae. He was unwilling to admit any fault. Go somewhere else for w