Shocking Service Vodacom Deceased Estate

My mother in law passed away 2 years ago. My father in law went to Vodacom N1 City twice (He is 80 years old) to find out if there is any amounts owing to Vodacom for her mobile contract . Vodacom N1 City could not assist nothing on the system. We have not received any outstanding accounts for my mother in law. There was an insurance on my mother in laws mobile number and Vodacom refuse to pay out. I have written over 10 emails to the deceased estate department. Estate has been wound up and finalized There is NOTHING more we can do from our side. Please refund the insurance to the beneficiary my father in law and send any outstanding accounts. What is so difficult ? Geez people This is not rocket science !!!!! Kindly sort out ASAP 2 Years ??????