Review Poor job done and no contact being returned

Got this guy a year ago to do my driveway. When he sealed the paving,it turned white and has not come back in colour and has also sunk. He wont answer my calls or messages and has said i can just sue him if I want recourse. Contacted Kilsaran and theyve confirmed he made an error with the sealant he used. I cannot sit in my back garden becauaae is so even and unsafe. WOULD NEVER RECOMMEND