The premise that 25% of people pay up without questions seems highly questionable. The only source for this is the company itself, correct?

Edit: why the downvote? Take a look at the direct quote from the article:

However, not everyone who receives a letter will pay up, but DRS says that an impressive 25% of all recipients do without asking questions. This figure is much higher than most people assumed previously.

Why would one take such a surprising number on face value, especially from a company with such a shady business model?