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I just meant that with a "should" there always comes the undetermined amount of unplanned time you have to spend, especially if dealing with anything related to computers.
Not always true. This greatly depends on your skills as well as on the complexity of the problem.
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So, yeah, it should not take long, and yet it took the company 4 days to realise the problem.
What I meant is that solving such a problem should not take too long, once the problem
has been discovered. Nonetheless I can understand that you're upset to them. When you didn't say that restart helped and that other sites worked, I started to be sure that it is an ISP problem, but from this distance I cannot determine it, and you told that they said the problem was not on their side. I was about to suggest contacting them again just before you posted that your husband talked to them.
When negotiating with companies, even if your ISP, be very determined (yet polite) and bugger them as long as you think it's necessary (e.g. if you assume that they are wrong). However, you're also undoubtedly right, they often consider the word of a man more seriously.