Poor service - *********** accounts department

I received numerous sms's upon calling Lancet Accounts advising that Mr William Wilkin has passed away I was requested to email the death certificate. Even after doing this i still receive the sms's and now on Mr Wilkin's cell phone as well. he is deceased how can he respond. They have not sent an invoice which I have requested. I was again requested to email the death certificate again to another department. I still receive the messages and called and they now advise they cannot understand why I am receiving the messages as it is with estates.