VODACOM - refusing to cancel DATA PLAN and now increased monthly installment

My Dad has a R45 data plan for his tablet - my mother has been trying for months for Vodacom to cancel this plan and she has been given the run around. First to say they need to wait till it expires, no problem, then when it expired, now he must be present even when she had all documentation - he is 86 years old and can hardly walk, surely there is a better solution than him coming in ????? Now the R45 has increased to R125.52 this month and it is putting him in an anxious/panicked state - come on VODACOM, surely you can do better ??????