If you are having trouble, here is the recommended plan of action (in order):
API Documentation
The official Twitter documentation can be found on dev.twitter.com.
Issues List
Use our new Issue Tracker to see filed bugs and file bugs of your own. Please include as much detail as humanly possible.
dev.twitter.com Discussions
Discussions on dev.twitter.com is the official Twitter developer forum. Twitter employees regularly chime in to answer developer questions and concerns. If you are have an issue or tip for other API developers, post it there, but please search for open discussions before posting a new thread.
The last line of defense. If you have exhausted the above list of resources and feel confident your needs cannot be met there, is to use this API support form: https://support.twitter.com/forms/platform and provide as much detail as possible.
If you need to change the owning account of an application, use https://support.twitter.com/forms/platform.