I had a concrete driveway done and the company did not put expansion cuts in the cement. The driveway is cracking and they wont replace it.

I have a rental property in Fla I live in NJ. The concrete was done in 1 1/2 years with no written contract. The concrete started cracking 3 months after but the tenant only let me know recently. The reason is because the company didn't put expansion cuts in it for expansion and contraction. I contacted them and they will not replaace the concrete. Since the tenant nor myself are familiar with concrete, we were not aware the expansion cuts were a necessity. Obviously the owner hired someone without experience to do the job and will not stand behind it. It is also cracking at the end of the driveway because the thickness is incorrect. The job along with a new culvert was almost 4000 dollars. He said the contract states no warranty, however we had no contract. It was all done by phone