first enthusiasm, but after only 4 months already broken

First we and our cats were thrilled. The tree was favorite toys and favorite place in the living room. However, after only 4 months of the tree is unfortunately broken. The strain was always shaky, has tried to my husband, this re-tighten. But unfortunately not possible because the thread is broken inside. Because, unfortunately, it will probably not be repaired must be running on a new (other) scratching post addition. Very unfortunate.