Cheapoair
Flight Change Fee Dispute Over Six Versus Twelve Month Validity

I booked return flights, Dublin to Sydney. I want to change my return travel date. The airline validity on changing is up to a year but Cheapoair is saying I only have six months. I have tried twice today, once on the phone and through their 'live help' to get an answer as to where in my original booking documentation, it says validity of six months, the only thing I can find is it refers back to airline, which again, having rung the airline myself, is 12 months. They both ignored / evaded my questions on this, and the 'expensive' difference in flight. I had checked both flights out and the date I wanted to change to, was $300 cheaper. I asked for breakdown of costs, only to receive a total amount by email and confirming the new flight (that I hadn't booked)?
The second guy ended the call, I was polite to both of them. What can I do?

Company: Cheapoair
Country: USA

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