Refuse to cancel policy of a deceased

My father who was the policy holder passed away 3 months ago already and we have tried to cancel his policy but Budget Insurance refuses to cancel and have sent us from pillar to post and deducts the premium every month. We have all the necessary documents but your *********** consultants are clueless and pretend to not know what to do. It's not difficult to understand. He is dead and we want to cancel his policy. Why are you continuing to deduct premium every month from a dead person