Enterprise used to get burned a lot on debit card rentals from people that didn't have the money in the linked account to cover additional Enterprise charges like damage or late returns. If you don't have supplemental insurance and return with a crashed car then they just charge your cc for the deductible. That doesn't always work with a debit card. Enterprise is really more of a used car company that rents cars. While it doesn't justify rude behavior or the hard sales pitch for supplemental insurance their sales people are generally over qualified because a college degree is required to be part of their management training program and almost all the sales people working for them are in this program.
I'd question that a college degree "over qualifies" someone for a sales job. I have one and I sold both real estate and mobile homes and I worked in a used car rental agency. Unless you get involved in certain specific degree programs, colleges don't teach you much of what you need to know for successful sales. But, it is unfortunate but true that many companies hire college grads for jobs that can easily be filled by someone who never saw the inside of a college class room - I'm not sure why they do that but I suppose it is related to the myth that everyone should go to college.
When I first got out of the Navy back in '64, I was looking for work in Dallas area... every ad in the paper seemed to want a 4 year degree with 5 years experience and applicants under 25..?? I ultimately found a job with a firm that sold industrial greases as a billing clerk... just needed to know how to add/subtract, multiply and divide... after a year I went back to Calif and applied with an airlines... I was told that I was "over qualified" for a dish washing job, but hired anyway... after 5 months, transferred to ramp as a loader, then into the cargo office as an office clerk... I ultimately became a supervisor.... when I left the airlines I was hired by a forwarding company an their international agent & supervisor. I ran several companies that had multi-million dollar sales and never finished my college... I did get my AA degree while at the airlines, but never went back for the 4 year degree... My son did 2 classes at the Univ of Texas and decided college wasn't for him... today he owns his own company and is well on his way to becoming a millionaire.
Sometimes I think a college degree is overrated... not always as there are many technical fields that do need the additional education... would hate that my doctor just put up a shingle and called himself a doctor without the training.