What should I expect from my host?

[koalat]

My host switched my server resulting in my pages being "temporarily down for updates" for anywhere from 1 -24 hours depending on the ISP. While the pages were technically online, they were also technically offline from my point of view.

Many link lists and TGP's removed my links as a result, killing my potential sales and traffic.

I want to ask my host about it, but don't want to come across as an asshole with some unreasonable demand for compensation. I don't even know if I'm entitled to compensation, in the sense that I don't know if they could have made it smoother on their end, or if this just happens when your host changes your server.

Also, I'm not sure what to do about the TGP's and if there's any hope in getting my links back, or if they would have just deleted them...