1 Life refuses to cancel my life policy

I took out life cover with 1Life around 2006. Later I added Nedbank and Wesbank as beneficiaries in respect of the mortgage and vehicle I was paying on to the policy. In September 2018 I left my job due to ill health. I decided to cut those expenses which were no longer relevant to me so that I could be able to sustain myself until my pension starts paying out. 1 Life was one of those which I no longer needed. I wrote all of them emails of cancellation early in October. All called back immediately to confirm my intentions. Except for 1 Life which did not reply to my email nor call to confirm. Mid October I called 1Life to check if they indeed got my email, which they denied receiving. I explained my situation which they did not appreciate. Instead they advised me to reduce my cover amount so I could afford which I refused. They then asked me to get letters from my beneficiaries on the policy to state they know they are no longer beneficiaries before they could cancel the policy. I told them it was not a condition to have a life cover when buying a house or a car and would thus not inform Nedbank/ Wesbank about the life cover being cancelled. I also warned them I would reverse all their debits if made by force against my account. In November I reversed their debit and blocked it on my bank account. They have again debited for December using a different code and I will be reversing that too. Once a company starts using gangster tactics to keep their business afloat, it's time to erase them from memory completely.