Cancel deceased mother's contract

<p>As the executor of my mother's estate I have been trying to cancel her contact since November last year. I was told to send documents to ********** which I have done twice. I just spend another 20 minutes on the phone being transferred to a number ( ********** ) twice that does not give me the option to speak to a concultant. What must I do? You keep collection money every month from a deceased person!!!!!!!!!!!!!!!!!!!</p>