Critical Illness and Death cover policy linked to mortgage

[Wendy123!]

I took the above policy out in 1999 and have bee paying £25 per month since then. I recently found out by chance that the direct debits stopped on 2023. The mortgage was paid off in 2014. The Bank changed twice and I have had no communication from them or about anything else over the years. After some searching they said that the policy ended in 2023 and although the mortgage was paid off in 2014 they had carried on taking the payments at about a pound less until 2023. I have complained and they refuse to do anything. The policy was for over £33,000 and I thought it covered me until I die. Any advice welcome.