This is what I do:
1) A response along the lines of 'Hey! We got your ticket! I'll take a look for you' and depending on the issue, my best guess at what's causing the problem
2) A follow-up once it's finished with the actual problem, asking the client to confirm things are working as...
You're so cute, sonwebhost! Looks like a copy/paste from http://datashack.net. If you're going to resell, please at least try to distinguish yourself.
I'd recommend https://www.wholesaleinternet.net/. I don't think I've ever seen anyone but OVH beat them on price.
It's a solid piece of software, but it really is lacking in features. I really really miss price overrides and all the nice graphs and money-tracking WHMCS did. However, it is nice not having to patch it every two days.
Including a python script to take advantage of it? Talk about responsible disclosure. -_-
Edit: localhost.re includes the script, not Aldryic. Important detail for those who don't actually click the link.