For some reason, the foundation pourers decided to create humps in the concrete around my toilet flanges so that the toilets can not sit flat. This has caused me significant hardship. Worst of which is the fact that the flanges have been rocked and pulled loose from the concrete. The concrete (slab) where the bolts would hold the flange on has been destroyed and I can’t figure out how to secure it. I’ve been told that cutting and re-pouring slab concrete is prohibitively expensive. I’m considering drilling the concrete at an angle out from the flange and trying to use a long concrete bolt and washers but I’m afraid I won’t be able to get it flush enough. Any ideas/suggestions would be greatly appreciated. Thanks in advance.