Today I received a recovery letter from DEWLP, saying that I owe them money for a licence upgrade from basic to advanced. I paid the $51 March fee as per the form, and attached my concession details, however they have sent back a letter saying I still owe them $14. Not impressed, as I did not change any of my details, just the licence type, and have been waiting over a month. Should I call them, and would it be likely to be sorted out?