Odd. As the repair was a service it definitely must have GST added. And, yes, you need to pay it. I suspect it was an oversight from the insurance company and you may well get an additional invoice in the future. Mind you, if you get another bill from their insurance company, I would respond by saying that you paid the last bill in full settlement and if they made an error then they can wear it. They will not bother pursuing you for $80.
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