Don't want to change banking details

My father has an account with Game, he is staying in Ventersburg (Free State) and don't have a Game or a bank in Ventersburg. Recently he changed from banks and now his banking details need to be updated for all his debit orders, his car broke and now he does not have any transport, so my father asked me to help him to change/update his banking details with all the companies with debit orders. I am staying in Pretoria and I only received a letter from my dad with his contact details and signature confirming his details has changed. All the companies assisted me to update the new details, except for Game, they don't want to accept a letter or my e-mails they need a letter from the bank or they don't change the details. This is really ridiculous as the account is going to go into arrears, maybe they will phone him to update him of the arrears. I even phoned the Care line for assistance and explained the situation at this stage but still they don't or can't assist. I really can't believe the struggled I had to send mails and even to phone just to be told \sorry"we can't help you....."""