Placers hate poly.
ALL CONCRETE CRACKS. ALL. You might not be able to see it but it does. Worked in quality control for a major concrete supplier for years. There are so many possible issues here. As said above. Make sure you let the contractor know you are not happy with the product he provided. Get the supplier and an independent engineer who is qualified to speak about concrete and geotechnical together and have a look. Allow the contractor to have his say too and go from there.
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