Oil change and no oil question

We took our Kia Optima Hybrid (2014) to a shop for an oil change. We’ve had the car nearly three years, no engine issues at all. Normally, my husband and his dad handle the oil changes, but we were going on a long trip, so we decides to take it in to make sure there were no other issues either. The shop came back that there were two leaks. Odd, because we have had no oil spills where we park the car, but okay. Give permission to fix. We get the car back almost a week later and it seems to be working. No signs of spills. About 40 days later, my husband is driving home from work and the engine starts making a horrible noise. He pulls over and listens to the engine trying to figure out where its coming from. I suggested maybe to check the oil. He says we just had the oil changed, the oil should be fine. He checks it anyway after the engine cools. It’s literally bone dry.
How is this possible? This tells me the mechanic that did the oil change did someone wrong, or didn’t put enough oil back in it? The engine needs to be replaced now and its not something we can afford.