One should get a refund of the canceled booking but my last experience is they did NOT cover the extra cost of booking alternative hotel. Had a NYE reservation

One should get a refund of the canceled booking but my last experience is they did NOT cover the extra cost of booking alternative hotel. Had a NYE reservation in London canceled hours before my flight. Had to get hotel rooms ( I brought my parents on the trip ). AirBnb support absolutely useless in rebooking (and no options, just one not close to similar listing repeating multiple times from different 'hosts'). What makes me so angry though was that a phone support agent told me they would give me 50% of a few days of the airbnb reservation cost to cover extra costs. I asked them to push too manager to cover full difference. But instead of offering to cover costs, over chat/email they claimed the phone person never made a promise and only paid me $85 (the difference was multiple thousands). I asked for the recording but they never responded. I looked into arbitration but the cost/benefit of my time wasted doesn't work out.