how can I get reimbursed for all the monies I'm spending to live outside my home?

The upstairs unit has caused significant water damage to my unit below. They have long delayed any repairs and still have not identified the root cause. The first time I mentioned it to the tenant upstairs, they mentioned they've been using towels to soak the water. So there is negligence on their part. We've communicated with our HOA, my insurance, upstairs tenants, upstairs property management, plumbers and no one is helping to get this resolved in a timely manner. It has been 3 weeks since we first told them and my family and I have not stayed in our home since then because I also found mold in the drywall as a result of the damage.