Hollard doesn't pay out on funeral policies

I have been trying to get Hollard to pay out on a funeral policy which is held with them. I put in the claim after my mother passed away on 20 July 2018. I have had absolutely no feedback from Hollard and when I contacted them after 2 weeks I was informed that the claim has been repudiated. Reason given - last to premiums not paid and when I gave them proof of payment - response was policy was cancelled on the date of my mother's debt. They promised to revert to me several times but I am still waiting.