So I called the guy who came back. He said, "Well, it looks like the mix for the backyard possibly was not as good as the one for the front yard." He then changed his view around, and rather then accept responsibility he said it was our fault for disturbing it before the required 4 week curing process was over. He only replaced the corner which had fallen apart. Now, I am no expert and that is why I am referring to this forum. In my mind however 3 weeks should be enough time for a concrete border to cure, and even if it did require a full 4 weeks, shouldn't by 3 weeks into it (under the hot 112 degree Phoenix sun), it be hard enough not to crumble so easily? Our argument was, well, if the front is solid as a rock, and they were both poured on the same day, shouldn't the back be equally as strong? The guy is not a licensed contractor (we checked after these problems happened) so we can't take him to the board of contractors. He is an LLC. He refused to replace the backyard borders besides the one corner citing it wasn't his fault, it was all our fault. In my mind though, it is not our fault if he mixed it wrong.
So I wondered if anyone who knew this field of expertise could give their opinion on the matter, and possibly refer me to some concrete standards or something. What retaliation is there for something like this? Is it really our fault even though we didn't do anything to it? How strong should a cement border be?
Thanks a ton for your time, - snipped-for-privacy@aol.com