Unhappy client

I took a funeral policy with Avbob some time last year and I am done with my waiting period. Two months ago I started receiving messages indicating that I must pay cash a certain amount and that puzzled me because they are deducting from my persal. Now their messages are getting heavier because they are threatening that my policy will lapse if I don't pay them. I signed a contract and I am not at fault that they are deducting less of which I never agreed on paying cash.