ABSA takes money for insurance policy but cancels the policy??

My mother passed away in November 2018, her house and house hold contents have been insured with ABSA since 1981. I have been paying the insurance premium monthly to ensure continuity until her estate is wound up. The premium is paid via EFT before it is due every month and the proof of payment is forwarded to ********** and ********** Today I get an sms saying the policy is lapsed due to non payment. I phone the number and am told the policy lapsed because I closed the bank account. No amount of explaining to the consultant helps as she cannot seem to understand that the bank freezes the account I have not closed the bank account. How can ABSA take the money every month and cancel the policy? What is happening to my proof of payment and why is no one communicating with me expect to try and sell me a new policy or get me to sign a debit order. When I explain it's a deceased estate and once the estate is wound up there will no long be a policy and I am not prepared to sign a debit order as the estate should be wound up shortly. HOW can ABSA insurance take the money every month and cancel the policy without advising me the policy is cancelled?