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Well that sucks. Hopefully, your differential is not damaged but it very likely is. And if so, they owe you for a new diff and all of the labor involved.
As for what you should do, I don't know. You could do like others have said and change the fluid a couple of times and see if everything is okay. But if you do that, you will remove the proof of ATF in the system other than your receipt.
You could maybe go back to shop that did the "work", speak to the manager or owner , tell them the situation and see what they will do for you. Then I would have the car towed to a Chevy dealership, tell them what has been done, and ask them to drain the fluid and document everything. And see what they say about damage to the differential and what should be done. And if there is damage, present the estimate to the shop and proceed from there.
And if you can, change fluids yourself.
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