Why is there a strange noise coming from my 2018 Subaru Forester and what can I do about it?

I bought my new Subaru Forester in 2018 from my local dealer and ever since day one I've had issues with a squeaky dash, poor steering and this strange noise that is intermittent, coming from the front passenger side (sounds like a wobble/wind/rattle like the wheel will fall off). Every service I've complained about these and they've either fixed it or said there is nothing wrong.

I did many road tests with them and the noises didn't happen until this year when their head mechanic heard it and was gobsmacked and had no idea what it was. They stated they sent a case off to Subaru Australia and came back with things to do and try. Yesterday I did another test drive with that dealer's service manager and he too, had no idea what it was either. So they kept the car again and looked into it.

I got call saying they've pulled apart that side of the car and there is nothing wrong but they still have the same problem with the weird wobble noise and can't find anything wrong, but they admitted there is a problem and they have no idea what it is. The manager says it is safe for me to drive. The manager stated since the problem is getting worse and worse to bring it back in three months and try again. I feel like its illogical to say, it's "safe to drive" when they have no idea what is wrong with it (especially since I said the steering is terrible and I have felt unsafe at speed driving it).

What are my options here? What next steps should I take? Should I complain directly to Subaru Australia or go to fair trading or something else? I think I have been fair and reasonable throughout this whole process with them considering it's been five years and I have complained about this issue, which they've acknowledged.