Best buy technician flooded my carpet, filed a claim but never be able to contact claim adjuster from Gallagher Bassett, what should I do?

Last week, a technician from geek squad, representing besbuy, came to my house and tried to fix the washer which I bought from Bestbuy. He successfully fixed the problem but left the washer's drainage hose hanging ,not properly installed, causing flood which damaged some portion of my carpet when he tested at last. When I saw the flooding, I immediately called Bestbuy, told me to call claim department, Gallagher Bassett, got a report number, and they supposed to call me but they never call me. What can I do to move forward? Does it make any sense to do some legal action against Gallagher Bassett? I read reviews about them, it is terrible and there are people expenriencing the same. It seems like they won't call me back or take any actino about the damage caused by bestbuy technician.