I have been extremely happy with how quick their support has been and they always try to go above and beyond when it comes to helping. It isn't so much of a "we can't-do that" but here is what could work for your situation. Even though we customized the heck out of our platform, they can still provide assistance.

Zoplay a famous one helps the folks all over the world to get the approval of the app. They also support on the product after the purchase such as doing customization changes, fixing issues etc.

The best part of Zoplay is that I was able to find clone scripts for almost all the most happening websites on the internet. Initially, I was a tad bit skeptical about purchasing the script from Zoplay, but my intuition was strong enough to go for it. And now I am really happy with the script as I can personalize it according to my preferences.