Well, a CSR with the attitude that anyone disputing their bill is a lowlife trying to weasel out of their bill, doubtless gets a lot of calls from lowlifes trying to weasel out of their bill - probably a lot more than the average CSR at the company.
Years ago, I worked for a while as a CSR for a phone company. I got lots of calls from people about their bills - wondering what a particular charge was for, why it was so expensive, disputing some portion of it. Funny thing, I never once got a single call from some lowlife trying to weasel out of a bill. I can't recall a single case where the customer was lying to get out of a bill. Plenty of times, a cynical rep might have concluded they were, but after a bit of investigation, their stories always checked out.
People who just plain couldn't afford their bill, didn't try to weasel out of it. They said openly they couldn't afford it, and we figured out how they could make their bills cheaper in future, then passed them on to accounts receivable - those were the people who could forgive part of the bill, and authorize payment plans beyond the default overdue bill limits.