Recs for Foundation Repair Contractors???

A corner of our home is settling quite significantly. Because we have a sandstone foundation, several contractors have told us that it cannot be 'stabilized' with helical piers or piles because the sandstone could crumble during the installation process. They told us that we might need to have the foundation *rebuilt* in that corner. Has anyone had this kind of work done? If so, do you have contractors that you can recommend? Or NOT recommend? ~ Dan