Gas Leak

Scroll down to the "ANSWER" at https://repairpal.com/gas-leakwont-hold-gas-at-all-697.

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I'm not sure why people are saying that this is an over fill. If you did over fill your car, then gas would be visible on your car below your fill spout and the puddle would be under the area of the fill spout, not under your gas tank which the picture seems to show.
A damaged seal between the gas tank and fill spout would leak when you're filling the car, and all excess fuel in the spout would leak out. After that, there would be no leak as the rest of the fuel is below the damaged area.

A quick way to check for this, would be to go top up. If it leaks again, its a damaged seal, if not, then maybe you did over fill.

Either way, you should get a second opinion from another shop.

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