Most likely the second company did all that can be done. The heads probably struck the platters. That said, you can try imaging the drive backwards with dd_rescue. Doing it backwards defeats the OS buffering in a way that can often restore more data.
For future reference, you were right not to try to fix the drive. Next time, don't even try to read it - image it first thing. Mounting it on Mac wrote to the drive, potentially losing data.
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