Vodacom.....no customer service

I am so sick of this company. They do not activate cancellations when we have submitted it several times. Every month they are still deducting my my dad's payment after they erroneously upgraded his account when it expired. My dad's contract ended end of November . We told Vodacom that my dad had passed away on 16th June , there was no leniency for my pensioner mother, she had to keep paying the account! They are still deducting payments for my father's account despite us canceling the contract 3 times. This is not on!!!! The customer service of this company is pathetic. Taking money from a pensioner!.