Was a geotechnical report available and followed? Did you have the foundation designed? Was concrete sample/tested at the time of delivery? If answer was no to any of the 3, legal action likely not going to be an option.
If concrete samples were not taken/tested at delivery supplier will point finger at placer, placer will point finger at supplier. Unless negligence is obvious and can be proven, your only chance may be to negotiate a simple cosmetic fix (if that) with the placer in my opinion at I suspect. And your chances are low even for this. As others said, concrete is going to crack in this climate.
99% of residential slabs are poured with a single layer of rebar near the bottom of the slab which is useless regardless of O.C. spacing and or thickness of the rebar as concrete will crack from the top, bottom, left, right, front, back, and so on.
If you want it done right...
- Design of grade beam, curb, slab that may require pilings based off of geotechnical report recommendations.
- A proper sub grade prep, compaction, moisture, frost control prior to placement. Test sub grade to validate it meets design.
- 2 layers of rebar (top and bottom) with appropriate O.C spacing with additional rebar at opposing angles for corners, drains, etc. Validate rebar to ensure it was installed to spec.
- Proper thickness of slab and thickenings if required.
- Use of the proper cement type, strength, slump, and air entrainment. Test concrete to validate it meets design.
- Proper placing, curing and finishing. Validate pouring/curing to ensure it was installed to spec.
Lots can go sideways with concrete and lots can be done to control cracking. Key word is "control".
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