Non rebooking on 2 flights by Jetstar staff

I just hope I get home today as your flights get cancelled for no reason and your staff are so unhelpful that even though I was online getting assistance when my flight was cancelled and I asked to be put on next available flight an hour later they didn't do this, I then phoned to get this done, quoted another hour later. Agreed just to get flight now I find that hasn't happened either so waiting 2 hours later trying to sort this out Jetstar you are appalling. Third time got booked on Qantas flight leaving 7.35pm (now postponed to 8.05pm) so instead of being home to have dinner with my husband I'm not even given a voucher for a snack or drink! Their social media just give the same B/S re helping but their staff are hopeless.