Terrible customer service. My flight was changed f...

Terrible customer service. My flight was changed from Jetstar to Quantas with departure time change without any notice. Since then Booking number was not recognisable nor Quantas, nor Jentsar. Tried to contact via call center to buy extra luggage. Wasted in the phone waiting for my Q for 30 min, 5 min tried to explain my problem to the representative, then call interrupted... Tried 3 more times to reach them. Wasted another 60 min on the phone. No success.