This is sad. We are busy too. Sales are up 300% this year and I have never been so busy. That being said, my day is not done until all calls and e-mails are returned. Additionally, an estimate for used gear should not take more than 72 hours if really complex. It is unfortunate that you are being forced to deal with such poor service.
That being said, those freight quotes are not crazy at all. They may seem silly but freight costs are just insane and those sound like legit costs. I can easily pay enormous amounts of money for shipping, even short distances. A huge part of the cost is in the pickup and drop off along with handling at the depots at both ends.