DONT TRUST anything these crooks say

Walked in on 8-2-2019& reserved a boat, a$50 charged to credit card& was told to bring$175 the day of rental. After traveling an hour plus we arrived the day of rental& was told to hand over another$300 cash? We have 3 witnesses as to what we was told friday at counter. I asked the clerk to produce the contract stating what he was saying& he couldn't. Basically DONT TRUST anything these crooks say!