Support is the appropriate place to contact on this issue, and I don't see any good coming from this being on the forums.
In the past, this type of thread leads to one of two outcomes:
1. Someone from the other guild becomes offended and begins a name-calling flame war.
2. Someone has found an exploit and describes how to do it in detail, and then it's everywhere.
Neither result is acceptable, so this thread is closed. Once again, if you have concerns about a guild using an exploit or cheat, contact Support, as they are the ones who can address that issue.