Continue to take money after Death / Termination Cert issued

After informing Bonitas of my mothers death and receiving a Medical Aid Termination certificate, they continue to deduct money from the bank account. Customer service is poor, and one gets the feeling they are chancers, as when I do ask when the savings account money will be paid out and the monthly contributions, my answer I receive is vague and something about in 4 months time. I have dealt with discovery in simi**** circumstances and in a month of the death all is sorted.