Frustrated

I sent a email last year cancelling my home loan insurance ref HBLB***. I could no longer afford it. They continued to debit me and I in return, returned them. Only for them to add it to my home loan account that was settled. I now have balance outstanding which i believe is *********. If I had a claim, would they have paid. They would not. I spent much of my time returning these debits, speakimg to consultants and incurring costs. This is my last resort.