Backdated cancellation of funeral cover

I've been trying to cancel a policy I took out from my uncle since April 2019 who passed away two weeks after the policy was taken out online. I have been to 3 Old Mutual branches,sent several emails and tried calling the call centre but nothing. They keep asking me for claim information on email despite me repeatedly stating that all I want is a backdated cancellation and a refund of all my premiums. How hard can it be to process backdated cancellation?!