We understand your frustration, and believe it or not we share it as well. The sensor enclosures have been tested and have been determined to work with our hardware, otherwise we wouldn't have launched them up for sale on the store in the first place.
As you may understand, it is not easy to understand what may have happened in your particular case unless we can look at the actual parts. The best we can do is open a complaint with our supplier to request a fix, or refund you of the total amount.
If you can have access to a 3D printer (e.g. from a friend or at a local FabLab), the fastest way to address your problem is to download the models from our website and print them (eventually scaling them up for a better fit):http://bitalino.com/index.php/development/3d-printing
The BITalino Team