DD moved back home in September. I duly informed the council and paid full council tax (previously I had single person's discount). She has now gone travelling for 6 months and then has a job starting in September - she does not intend to move back here as the job will not be commutable from here; however, she does not have a new home as she is travelling.
The council tell me I am not able to claim a single person discount without proof of my DD's new address. AIBU to think that I should not be held responsible for my adult DD's living arrangements.