Fischer Restoration

Our bathroom floor had water damage. We called Fischer in June to come repair, and opted to use insurance to pay. We also request a few upgrades: use tile floor instead of vinyl (120 sq ft), install 2 pocket doors, and move a light-switch. They provided an estimate for all work, including insurance and upgrades. We signed and they ripped out the floor. It was weeks before they came to do more work. Supposedly they were trying to find shower tile to match what we had left after the tear out. In late August we finally got a change order that indicated they couldn't find the tile and needed to replace the whole shower. The change order also included some upgrades and the price seemed high, but the estimator assured me it was also an estimate and pressured me to sign so we could continue work. Since we had already waited over two months to have work done (living without a shower and toilet that whole time), I signed. The project dragged out for a total of 7 months. They told me to explicitly not pay until they finalized the bill, so I waited. I asked many times about it. Meanwhile, I had to take on the burden of managing the insurance payments because they wouldn't do the work themselves. Finally insurance was fully paid and Fischer told me to pay the exact amount of the estimate, stating it was a contract the whole time. Now I am reviewing in detail and found some items that were never completed (moving the toilet over 18" was one). They are refusing to take this off the bill, even though it was not done. I am also finding out that a subcontractor who came in to help later, because Fischer couldn't complete the work themselves, will be charging me pieces of the items Fischer is charging me. For custom upgrades (tile floor, doors, light switch) we are being charged $4300 by Fischer and several hundred by the subcontractor. It does not add up. Fischer has resisted to provide us with line item cost of materials and labor for custom work for 4 weeks now, even though that is part of the contract.