Coming after my dead father for money

If I could give a 0 or a - star I would. Beyond pathetic. I am getting phone calls every single day, SEVEN MONTHS AFTER MY FATHER PASSED AWAY, for his arrears credit card. Which only went into arrears after his death, and after they have been notified by Sanlam Trusts that he has passed away and that they are the executors. The people they have on their call centers clearly don't have two brain cells to rub together, and forget about trying to get through to anybody who can string a sentence together. I don't know what they expect - maybe tomorrow when they call, he will be available to take the call.