Harrasment and pain and suffering

My son passed away in August month and ive sent his death certificate to one off their staff members on 28 August yet everymonth i get notifications on his cellphone to update his banking details and requesting payment for the account. I THINK 5 MONTHS OFF HARRASMENT AND KEEPING MY SONS DEATH A PAINFULL EXPIERINCE IS ENOUGH. IM CONSIDERING FILLING AN HARRASMENT CASE AGAINT THEM FOR IT AS WELL A CASE FOR PAIN AND SUFFERING . AS WELL FOR MY ACCOUNT WHICH I CANCELLEND END OF JUNE ALREADY AND ALSO BEING HARRASED FOR PAYMENT WAS ENOUGH NOW.