What Should I Do?

Last month I purchased a lg wash tower from Costco. The delivery crew didn’t insert the proper length of the drainpipe from the washer into my drain system in the wall (inserted about 3-4nches instead of 8” plus). This caused flooding in my laundry room. Damaged my flooring, closed door, laptop that was left in a bag, etc.
Called Costco and they opened a damage claim immediately. They also advised me to keep the unit until the claim is resolved.
I figured out what the issue was when I called a vent cleaning company to clean my dryer vent after dryer kept stopping middle of the cycle with an error code that indicated possible vent clogging and when I told them about the water leak, they were the ones that told me to check if at least 8” or more of the drainpipe from the washer was inserted into the drain system in the wall. This is the moment when I noticed only 3-4 inches was left inserted which caused the water to kick back out onto my floor.
Anyway, the claim agent asked me to send photos of the damages ( I did). Then asked me to get a licensed contractor to come out to give me an estimate (I did). In the meantime a second crew of theirs came by to ensure everything was properly installed and this crew confirmed that at 8” of the drainpipe needed to go into of the drain system in the wall. They also confirmed that the dryer has a manufacture defects and the unit needs to be replaced by Costco.
However, now I got a call from the delivery company owner I believe who wants to come out to see my laundry room, to take pictures and all. I believe they are just trying not to pay for the damages to my property and not sure if it makes sense for them to come out now after I have provided them with vent cleaning company as a witness to the fact that they improperly inserted the washer drainpipe, provided a written statement, provided photos of the damages and provided an estimate from a licensed contractor.
Should I allow them to come and take more Pictures and all or should I refused and demand they make payments for the damages or file a case in court?
Please advise?
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