Join Date: May 2012
Location: Munich, Algarve, Sussex or S.F Bay Area
Programs: Mucci, BA Gold, A3*Gold, AA Plat, HH Gold, IHG Plat Amb, Marriott Plat
Posts: 4,190
You have a valid ticket and SQ are responsible for getting you to your destination. They cancelled your flight so must book you an alternative. Problem is that there’s currently no Star Alliance flights operating out of Perth.
I would suggest Qatar via Doha to Frankfurt. Request it from SQ. When they refuse, then buy a ticket and sue SQ when you are back home in Germany for the money.