Blocks my 79 year old grannys number constantly

My Granny is 79 years old, she has a Vodacom number since she was in her 30's. Since the beginning of this year she has had an issue with Vodacom updating her sim card or doing some sort of nonsense to her sim where her sim goes off. Then she gets sms's saying she has to RICA her sim again. This is the only line we as her family can get hold of her on, we rush to her house when we cannot get hold of her just for us to see that Vodacom once again blocked her number because she has to RICA it. This is seriously pathetic, my granny is 79 years old, she cannot keep going up and down to Vodacom on a monthly basis to fix her sim. When I called customer care now, I was told by the same guy that the guys in the store don't know what they are doing and nothing shows on his side that the sim was updated. Now this alone shows how pathetic Vodacom is because we go into a store every month because Vodacom cannot figure out what they want to do with my granny's sim card. Now once again for probably the 5th time this year I need to take my granny to Vodacom to get her sim sorted out. If anything happens to my granny and we are unable to get hold of her because Vodacom keeps blocking her number, we will take legal action against Vodacom.