Unfair Medical Aid service

My membership number is ********** 2060,on this scene I have my two kids and my mother who is a pensioner,my mother has been treated for renal failure from the 23rd of July 2018, from that time the doctor prescribed that she goes for dylisis 3times a week, from that time the medical aid has been paying for claims without a problem, so on saterday the 6th October my mother got ill and she was rushed to hospital at medical towers/isipingo Durban, now my mother went through theatre for a procedure to change the pipe for dylisis and had to do dylisis after that procedure, I then received a call from hospital saying my medical aid has not authorised the claim I need to call my medical aid,firstly the doctor wrote a motivational letter to my medical aid but still was declined, I phoned them ,they said they will get back to me but I only received a letter stating that they are declining the claim ,my mother is 70yrs old and her condition is very critical,they are discharging her after all these proceduresites that were done on the same day ,is the medical aid for its benefit and not for us when we need it ,I've been paying having no one sick and admitted so now just because I'm using it now they find reasons not to pay and I have loose my mother when I was trying to give a chance for more days,can you please help I can't keep my mother home in this condition and she has started dylisis it would be fatal for her to stop now.my concern is ,the medical aid has been paying for my mothers treatment and they haven't told me the funds are exosted. Please help Kindly respond to my ********** za/ ********** Com. Thank you