Old mutual ignoring my pleas

Dispute in regards to a Life Policy against Old Mutual, l, being da son of my late mum, , has been servicing the policy from 1998 in South Africa to presently 2020, my mum immigrated with my sister n her family to Australia in 1998, she subsequently passed on 31 July 2019, my sister *****entually made a claim against da policy in 2017, claiming to be paid up, l immediately notified Old Mutual,. that my mum is totally incapitated and on what legit claim have they processed a claim from a foreign country, without da necessary documents of my 92yrs mum, l complained to da Govt. Ombuds, da policy was reinstated n l being da beneficiary, sister in Australia refuses to release my mum's death certificate, l even sent Old Mutual a video of the funeral, requesting payment, they refused, insisting on da death certificate, l even requested assistance from Old Mutual to request their Office in Australia, to acquire da certificate from da Hospice she had been residing, l had even sent Old Mutual an official letter from da Hospice in Perth, stating she is totally incapitated, no assistance received, nearly a year has gone by, n l am still paying towards my late mum's policy even tho she passed on l. urgently require assistance to resolve, otherwise, l will have to revert back to da Govt. Ombudsman to resolve,