conv: A customer is refusing to pay a bill because they claim it has already been paid but cannot provide any proof of doing so. It is so frustrating having to deal with difficult customers that don't want to pay their bills/ i like to call them deadbeats Normally I would agree. It only seems to be a few here and there. Most of the time I dont have problems. what do you collect for ? credit cards or utilities ? We are a retail outfit. So we have some big customers that pay on established terms.