Whilst I haven't received a letter in the recent debacle I did a couple of years back, whilst I don't condone taking it out on staff they were the cause of a lot of my issues, my business is a partnership between myself and my wife but the partnership agreement has all income going to me, this isn't that uncommon.
We had to go in for them to evidence some papers for the family assistance my wife receives and although having all the relevant documentation the incompetent employee decided to attribute half the income to my wife despite me pointing out to her the error at the time, so we now had a debt for thousands
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Here comes the big issue, dealing with Centrelink in order to correct their stuff up makes banging your head against a brick wall look enticing. I can't remember the exact time I spent on the phone and actually in Centrelink getting this resolved (days not just hours) but it would have easily cost me four figures in lost income, a number of times we were told it had been rectified only for it not to be, eventually thankfully we found a rare competent employee who actually knew her job and actually resolved the issue.
Then there was the time that they overpaid us because although they had asked for my expected income for my wife's family assistance and I deliberately waaay overestimated it to avoid receiving any overpayments, they for some inexplicable reason decided to use a smaller figure resulting in us being overpaid and having to repay a debt
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I feel for those going through this as I have been there myself, hopefully, due to the magnitude of it and the media attention your issues won't drag on as long.