What, If Any, Are My Options After Plumbing Company Didn't Fulfill Contract And It Caused Significant Damages.

Contract Clearly Stating pump, removal, and disposal of old septic

Sorry my writing is a bit scatter brained as I am writing while thinking.

Some context. New split level ranch home owner, new to almost everything. Living in NYS.

Started out buying a house during covid. First mistake. Not being able to take a real thorough look through the house due to covid constraints caused us to miss a lot of little stuff. Also some very big stuff.

By the first winter our septic backed up (strange as it was "Just pumped and inspected") Obviously this was incorrect as the septic tank was an old metal tank with no top that was falling apart. Company told us we needed to have it replaced. $20,000 later we have a new septic tank, leach field, etc. This new septic system was going to have a pump mid way to help expel waste water to the leach field. In order to save a few grand we decided to have them raise the system higher than the old one to allow gravity to do all the work. I told them this was fine, even with this causing an inability to have a working bathroom/shower in my basement without up flush and pumps etc.

This is where it gets bad. Our old septic tank was located partially under our deck and for some reason the leach field was buried underneath an above ground pool. The company doing the work spoke to me about this and I stated that they didn't need to remove the old tank but did need to make sure it wouldn't cause problems as I did not feel like having them rip down my deck. They pumped the septic tank, but that was about it. They did not fix a cap, fill will concrete or sand or anything of the like. Coming back to lifting the new septic system up so it can gravity feed to the leach field cause the company to not bother removing/capping the old septic drain pipe from the house to the tank. This pipe also fed a small drain in my garage that was capped, but of course the company didn't re-cap after trying to snake my septic through there.

This all happened right before winter, snow was just starting to fall etc.

Come spring thaw, our basement was flooded with water. Me being new to the game and broke decided to call up my insurance company and see what they could do/if i was covered. Nada as it was caused by "groundwater". All summer I was looking for where the water came from as it was all over in my garage, my downstairs bathroom and went along the wall behind baseboards where tile met wall and into every other room in my basement. First though and what looked like is cracks in the basement cement wall. spent 2 days shoveling and creating a french drain to alleviate some of the water reaching this wall. Next heavy rain, flooded again. Queue me digging back up the french drain and digging deeper to get to the bottom of the wall. Sealed all the crack in the wall and waited for the next rain fall. Great! that must have fixed it!

Long story short it did not fix it. Made it to winter and of course by the time the thaw came we were flooded again. Turns out the old septic pipe that ran into my house and partial drain to garage was flooding my house as the septic tank wasn't removed/capped/dealt with properly. Queue me digging this same trench a 3rd time to find this pipe, I've done smashed the shit out of it as it was old cast iron. Filled it with gap filler and sealed it with flex seal on the outside. Filled the hole with concrete on the garage side and filled the septic tank side of the pipe with gap filler once again just to be sure. Viola no more flooding and my basement is now dry.

All the while the entirety of my basement and garage grew a pretty intense amount of mold that cost me roughly $6000 to remediate as well as having to tear down everything in my basement to studs. I'm finally starting to piece everything together again.

Sorry that was a bit long winded. What are my options? Can I sue the company that did the septic for breach of contract and causing significant damages? Should I call my insurance back and explain that it wasn't from groundwater per se and that it was actually due to negligence.

Thanks everyone in advance!