Jiffy lube Stripping oil drain plug Reno Nationwide

My wife took Honda Accord for oil change. When she picked up the car she was told that the oil drain plug was stripped and that she had to buy a new one. In the meantime they put some kind of temporary plug. It's interesting that there was no oil leak  before and if the new plug is going to fix the problem or will I have to change the whole oil pan. I'm afraid to go back there and leave the car in hands of bunch of kids that have a lot of other things on their mind when working on your car.  and how do I prove that they have damaged my car. I can promise you one thing, will not use their service again!