Can not understand/Harrassment by Edcon

My wife died in May 2015. Despite the Liquidation and Distribution account approved by the Master of the High Court and finalised Edcon send me weekly SMS's and email reminders that R70 or something like that is due. As the Executor of the Estate I send them the Death Certificate and confirmed ZERO/ZIP/ZILTCH/NIL/NOTHING/NUL is or can be indebted to EDCON.