Plugin for “management”

Hi There,
I run a small IT company and am looking for a plugin to do the following:
I seek something that my customers can log on to and see what support they have and see what devices they have covered as well as seeing their bill, similar to how you can see your package and bill online with Sky.
So for example, Mr Smith, logs on to my site, clicks on “My Account” and sees that he has 2 iPhones and a laptop covered with us and his bill is £X.XX per month etc.
Does such a plugin for this kind of thing actually exist out there? If so, whats it called?
Many Thanks