You'll most likely just have to email Ebaybanned a picture of the broken buckle and they will probably send you another belt.
That is what they usually do/ask me when they send me something wrong or broken.
And usually they don't even ask you to return the broken one.
"Certainly there is no hunting like the hunting of man, and those who have hunted armed men long enough and like it, never really care for anything else thereafter."
- Ernest Hemingway