Cell-C Suing a Dead Person

We received a letter of demand and threats to send a summons from a company called Select Online, sent on behalf of Cell-C. For money owed by my father. Now the catch is, my father passed away January 2017. Cell-C are in the possession of the death certificate, and this was discussed and emailed to Lungile Ntuli. I also tried to email the certificate to Krishnee at Select One but the email failed to send. I find it rather heartless that Cell-C have not rectified the details on their system as to him being deceased, as the person who receives these notices is his widow. Now if Cell-C want to issue that summons, you are more than welcome to contact me for the GPS coordinates for where his ashes are in the Kruger National Park. I would like this issue sorted it, and for Cell-C to please cease issuing notices for a dead person.