No proper communication within the company

I am absolutely tired of receiving phone calls from adt regarding payment of my account. My late father was the account holder. I have already signed the death waver an dealt with the necessary documents in order to have the year grace period. I recently spoke to a person from adt accounts named viola, this woman was very rude and abrupt saying I had to pay the amount for January when this death waver was handle in December 2 weeks after my fathers death. i would like to know how this issue will be dealt with because I am just sick of unsympathetic, *********** people.