While you've suffered significant damages, those damages are unlikely to be significant enough to convince an attorney to take your case. I suggest filing a small claims lawsuit in Milwaukee County. I don't see where the contractor is coming from on the economic waste rule. If anything, I suspect that your diminishment in value EXCEEDS your cost of repairs. Who would want to buy a property with a cracked driveway?!?
You may bring a claim in small claims court. You should also consider consulting with a local lawyer to review your case in greater detail. This sounds like bad conduct on the part of the construction company. But, given the amount in dispute, small claims court might be your best bet.