Hold on now. Make contact. If what you say is true and they're ignoring your complaints then you can still get your money back if you paid through PayPal or a related service through a dispute. Meffert's is the puzzle shop I trust most of all. I have yet to hear about a problem with Meffert's that hasn't been dealt with maturely through customer service.
You aren't actually asking for a Circle Cube. You're just bashing Meffert's. If you were really looking for a Circle Cube you would know to check here
Your question was not phrased as if you were maturely asking the community if we knew where to find a circle cube. It was phrased to completely derail the topic into solving your problems with Meffert's which you didn't feel the need to explain. If you really wanted help on your problem with Meffert's you would have taken the time to explain what the customer service has been telling you, if at all.
Andreas Nortmann wrote:
Things like this are illegal.
If not I will pass an appropriate law.