Constant phoning a dead woman!

I am sooo frustrated with MBD!! The been phoning since December wanting to speak to my Mother with regards to her Edgars account... My Mother passed away in June 2017!! All docs was emailed to Edgars in July already... I mailed it to MBD aswell... The note is made on the system that she has passed but they phone me every day!.. I have shouted sweared and cried... what do I do they phone my Dad and its upsetting everytime they phone.. Monday I will be contacting The Law Society!