S & W Ready Mix Concrete

S & W delivered concrete to my home. One of their trucks is leaking oil and hydraulic fluid. It got on my grass and killed a big spot of grass. I've called the company multiple times. They act like I'm lying, or it's not their fault. And multiple times they said they'd send someone out and call me back. They have done neither. So they're delivering concrete in a truck that's leaking hydraulic fluid and they dont care. They've lost my business.