Good concept, poor execution

The castle does at first glance actually a high-quality impression. But now I do not even got it two months hardly used, and now the combination lock can not be opened. Bin 100% sure that I am using the right, set by me combined. The rotating mechanism seems unreliable, as if the combination had rotated by itself or the mechanics inside no longer rotates properly. Opening with key helps here by the way not because the lock case opened at another location (even if it should have its code forgotten times!). Can use only with keys so now. But that was not the intention.