Harassing old women over incorrectly processed claims with no communication about money owed prior to debt collector calls

Blake and Associates have been harassing my 84 year old grandmother over a bill that was handed over by Pathcare. Pathcare made no attempts to contact my grandmother about a shortfall on a payment made by her medical aid. The reason stated for this lack of communication was that my 83 year old grandfather who was dying in hospital could not provide an email address and also that apparently my grandmother has not been answering their calls on her landline, if they had called she would have answered as it has been the same contact number that she is now being harassed on by Blake and Associates. We asked the consultant to Kindly STOP calling her, as there has been a processing error on the part of Pathcare and they are too useless to actually communicate with their clients and instead resort to handing over accounts when there is no justifiable cause to do so. We have indicated that the matter is being dealt with by the medical aid and do not appreciate the increase in call volume since this request has been made. This conduct is appalling.