Evidence of previously insurance company

Good day I have a problem I joined capitec funeral insurance on August 2021 and was active on 1 September 2021 for my mother in law. So on the 15th 2022 my mother in law died which is on the 5th month, so the claim declined because of waiting period. Waiting period is 6 months. So they gave me the other choice that if there was other insurance company that my mother in law was a member and lapse within 31 days. So here is my story: I joined Nestlife Assurance funeral policy since 2018/2019 until July 2022 for my mother in law. So on August 2021 I noticed that Nestlife did not debit on the 25th of August 2021, so l called Sales person that whom I joined to her. We had conversations telephonically that the company is liquidated as from 17 August 2021. So immediately I joined Capitec Bank Funeral insurance. I didn't received any formal letter from Nestlife Assurance company stated to me that they were no longer active. Capitec Bank funeral policy said to me I must come up with the evidence of I was a member at Nestlife Assurance company of which that company liquidated and sent to them media statement. So the only evidence I have is the bank statement from Capitec Bank that shows that company deducted from my account since 2018/2019 until July 2021. I didn't sent the bank statement that shows that because I'm waiting for their response that I must send it. Since I emailed it to them I received no response. Can you please help me in this case to ask them what other evidence I must give them because the only evidence now is bank statement.

Kind Regards, Ntombiyakhe ***