Discovery doubles pensioners premium with no notification/resolution.

My mum is a pensioner, was never employed and a widow now for 6 years, when she opted for Key care medical aid, she clearly told them her income and mentioned being unemployed. Now for the past 2 months her premium has doubled to over R3000 a month. Discovery just states she was supposed to declare income again, for which she never received any communication, email or sms. what right does Discovery have to suddenly move an elderly person to the highest premium bracket, when they failed to even make contact with her to even discuss or check her status? Who made this ridiculous decision on her behalf? How must she survive if all her monthly money is taken for medical aid? Did discovery think a 60 year , never employed women is suddenly going to get a job? Now she is expected to get transport to go to a police station for a silly affidavit declaring her income???!!! She doesn't drive, lives alone and in another province from me.

How on earth am i supposed to fix this? Discovery is utterly useless and does not care for their elderly customers!!! Till date, nobody has contacted her to try rectify or help her.