I took out a home contents policy with Auto & General three years ago and have been diligently paying my premiums, despite several increases without my input

I took out a home contents policy with Auto & General three years ago and have been diligently paying my premiums, despite several increases without my input. Recently, my home was burgled, and I submitted a claim with the required documentation, including the case number and photos of the ****** items. However, the insurer is now requesting a receipt for my damaged TV, which I purchased years ago and no longer have proof of. Furthermore, they're asking for an inventory of all my household items, a requirement I wasn't aware of when I purchased the policy. This request has been made after I've already filed a claim. I'm warning others to think carefully before taking out a policy with them, as it could lead to disappointment and frustration.