I have a few Moza products - a couple of car related steering wheels, a base unit, pedals, 2 gear shifters & a handbrake. Touch wood I've not had any issues (not to say they couldn't occur!).
The main takeaway is to try & buy the equipment from a store based in your particular country/region. That way if there are any issues the store has to sort out any warranty issues. (I know it's a wee bit late for you jmig!).
Unfortunately, these issues can also occur with other manufacturers products. I had a faulty Virpil gear-lever control panel that arrived with an issue & had to be returned under warranty back to Lithuania. Virpil were great but the courier less so, with a similar situation getting it sent back for a replacement. (I do own 4 Virpil products).
In the end, despite that, it wouldn't dissuade me from purchasing again from Virpil (or Moza) in the future, as long as I can get that product locally, if possible.
Glad to hear you have had your issue sorted out in the end, jmig!
Keith.