***** - claiming subscription from deceased and unpaid services

My mother sadly past away on the 29th April. I contacted Discovery to findout what needs to be done to cancel the Medical Aid. They advised I needed to send a certified copy of ID and the death certificate and the Medical Aid would be cancelled and any funds taken after her death would be refunded. I submitted the death certificate after receiving it on the 5th May. Over the weekend, before they even received the death certificate they terminated the membership but the subscription for the month of May had already been taken. They owe my father a refund!! I followed up today to be told I need a Power of Attorney to query anything for my 79 year old dad or to follow up on unpaid hospital treatment from her pre-authorised stay in hospital which lead to her passing. This is *****. You took a subscription from a deceased estate and joint bank account of my parents, my father is very much still alive and that is his money in the joint account. This is unacceptable. This needs to be addressed immediately and I want the outstanding hospital accounts settled as well!!!