Have been lied to about changed fare prices

I had to change my flight and add my husband as extra passenger I called jetstar and was told the $55 flight was now $90 for my husband (my son later told me that on line the fare was still $55) When I asked the Jetstar staff he said no it was now $90! A lie!!! Then my changed flight which was $139 was going to cost me $110 to change

The week before I had to change my flight for compassionate reasons I had paid insurance and was told I would have to pay $500 extra. The phone call was cut off and when I finally got through they told me the fare had gone up to $560 I said my niece is dying don't you have any compassion !!! They said this is the price!! Under pressure I booked ..
I am appalled at Jetstar we have flown at least 70 times in the past 7 years!! The most frustrating thing is I can't even speak to someone in person to make a complaint! Jetstar are a disgrace!!