We employed a contractor to lay a patio and a concrete driveway. The patio was good but the driveway is a disaster. The concrete has been poorly laid, not tamped down properly is uneven and not finished well. There are holes and a honeycomb effect on part of it and part resembles a ploughed field. He didnt use wood on the outer edge so the concrete has ran away and the edge isnt anywhere near straight. He's used sand and cement on a patch to try and cover some of the disaster. There's cracks all over it and its only down 2 days. Is there any way to fix this? Is it possible to sand or grind it to smooth it out? Because of the levels you couldn't pour more on top. We are out a small fortune and I cant afford to pay someone to dig it all out and start again. He hasn't offered any solution and is avoiding our calls and I doubt he has insurance.