Verb conjugation of "beliefern" in German

This website helped me learn French. Although most of the users intend to learn either Spanish, German and English some users come here to learn French. I met a few people that helped me with it.
Anyway, once we arrived at the guest house the rules were explained: Washing my Jeans would be 2 dollars, a pair of socks 1 dollar and so on. I did not feel comfortable with these people.
The travel agent's representative promised that they would return us the difference of the money. They also assured us that we would get special treatment, such as extra drinks and a Kayak expedition.