Jet/Hollard funeral policy

My Uncle paid for a Jet/Hollard funeral policy. He died over a month ago and I as his next of kin, have been fighting with Hollard, to have the policy paid out. They claim that my uncle did not name a beneficiary on the policy, even though I am named on his Will as the person responsible for his funeral arrangements. I have sent them all the policy documents, his death certificate, copies of my ID, letter stating that I am the executor of my uncles estate and details of my bank account, but they do not seem interested in helping, even though in their policy, they state that they pay out within 48 hours. I am very unhappy with there service and I would like this problem resolved immediately