Jetstar is unreliable and "bullshitting" customers

My mum an elderly person was booked on a flight to return to Singapore on wed 25 March and was notified 2 days earlier that flight cancelled due to "engineering" issuesvand the options were via Sydney on a 19 hour journey...imagine a person of her age having to do this. We however booked her oN another flight JQ7 flying out at mid day wed 28th and received a text at 7.40am saying it's delayed till next day 2.30am!!!!!! This is absolutely terrible and unacceptable. I want a full refund for both flights!!! Pls share this and the way this arline treates customers is unacceptable esp older people!!!

Australia-Melbourne - Tullamarine