Back in 2013, DP and I moved house. It was a bit of a stressful period and 24 hours after we moved in, he left. He took all his stuff home to his parents and we didn't talk for a while. I called the council and let them know; but didn't tell the landlord as I needed somewhere to live. He stayed on the tenancy. All bills etc were in my name. I lived there until 2015; by the end we were rekindling and he stayed sometimes but I never considered him living there. He spent most of the week at work, and 90% of his free time at his home at his parents. He stayed registered with the dentist etc down there.
Today the council have contacted me. I am now exempt from council tax but they are now investigating what I should have paid. I was expecting them to pay circa £2k back to me; instead they have said I need to confirm in writing that he didn't live there or we owe them around £2k instead, as my exemption only creates a 25% discount.
They admit that I told them back in 2015 that he didn't live there and at that point they switched it into my sole name; so I'm confused as to why I need to confirm this again... I'm worried they are trying to trick me. I have severe bipolar, hence the exemption, so I find this type of thing really stressful.
AIBU to think it should be enough to say that I lived alone most of the time to the best of my knowledge four years later?