We've had large cracks develop in one of our corner pool copers since the stone was laid about 12 months ago. And in a couple of others the mortar has cracked and/or fallen out from movement. After we complained, the paver that we hired said six months ago that he would order a replacement corner coper and chaulk the gaps. We're still waiting for him to return... Is there a body that I can complain to about the quality of the paver's work? Really keen to get the problems rectified and don't feel I should have to pay someone else to fix them...