What to do with such people?

This person was part of a new year party we had at a friends house where we decided to split the expenses. When new year was over I wrote the expenses for booze on the group chat ( came out to be ~1700) per person, usme bhi he is saying this,also lying because the person who was making the drinks told us he drank way more than that. This person just showed up to the party, opened the food packets, ate, enjoyed and left. We did all the preparations, got all the stuff together cleaned the house and everything. Agar aise hisab karte rahenge toh fir toh hisab hi calculate hota reh jayega. How do you deal with such kind of people? Getting him out of the group is not an option as he is a cousin of mine