Water remediation crew did more damage than the water

[Nellie Fitzgerald]

Recently we had a minor sewer backup, which soaked the carpet pad but didn't leave any standing water. We hired a pro water remediation company and asked them to remove dry wall, base boards, carpet, and drop fans, dehumidifier equipment, as well as apply any anti-microbial disinfectant, etc.

However, shocked did we find out that they destroyed the bathroom without any notifications to us. Include damaged cement board walls in unaffected areas, threw out the vanity, damaged one water supply valve, tiles. In addition, they destroyed every door on the level. Currently they don't answer any of our calls or communications regarding the damages and the work they did. Btw, landlord insurance doesn't cover this.

It'd be great to hear your ideas and wisdom on:

 The company wants full payment (we paid half up front) even though they incurred more damage than their service. How should we handle it? What would be a good outcome of the negotiation with them? 

While trying to repair the damage (new tiles, new toilet, new vanity, new door, new cement board, etc.), how should we work with our tenants? We have good tenants but their lease ends in one month. The whole situation might deter them from renewing especially when the lower level is not fully usable now.

Thank you so much.