Nice to see another Azimut owner!
Not sure who you bought your boat from but they DEFINITELY should be resolving your issues with whoever they have responsible for electronics. If they have been trying unsuccessfully to fix, they should just replace the unit itself (or the wiring?).
If need be you should go direct to Azimut and make some noise that you need help ASAP.
The other alternative is to call Raymarine and find your local dealers for the product, but if I were you I'd be pressing the dealer and/or Azimut.
If you're really stuck, PM me and I can give you the name of the company that does the electronics on my boat. They are super busy and not local to you, but perhaps they can help. They work on boats all over the east coast and do good work, but I've learned you can't always get them to do something right away. I don't have Raymarine on board, but they probably handle it as well.
PS - post some pics of your boat!