Continous reminders for account already paid

My son died almost two years ago. Since his death I keep getting reminders for an account that was not paid in 2013 (almost two years after date of service). I contacted our medical aid who confirmed that the account was paid and sent me proof of payment to which I forwarded to Vitalaire. After numerous phone messages being left and continuous emails being sent, I have still not had any response and to this day still get accounts sent to me stating that I owe you money. <br> <br> WE ARE TRYING TO GET THROUGH THE LOSS OF A CHILD AND WITH CONTINOUS REMINDERS OF UNPAID ACCOUNTS WHICH HAVE ACTUALLY BEEN COVERED BY MEDSHIELD , IT IS NOW BECOMING UNBEARABLE AND INSENSITIVE ON THE PART OF VITALAIRE. IT IS A DISGRACE THAT YOU CANNOT RECONCILE YOUR ACCOUNTS AND DONT EVEN BOTHER TO RESPOND TO EMAILS OR ANY OTHER FORM OF COUMMUNICATION !!! ENOUGH IS ENOUGH