Vodacom is abusing old people now

My grandma who’s 74 years old has had contact with Voda for years . What they are doing to her is uncalled for . She pays her account monthly without fail , for some reason 2 months ago they said she didn’t pay . We went to the store with proof that she paid , they said they will fix it . Till today they keep locking her line . She went to the store the manager in highveld said she will call last month till today no call . Her line is blocked she must take a taxi every month to go and fight ? It’s not fair, she’s old for this I’m very disappointed n I’m planning to take it to twitter bcos what the hell