Unfair bank charges being charged

I've switched bank accounts and informed telkom via the bank and by phone call. My phone and pocket router went off my new bank account and my wifi went off on the old bank account which has no funds in. I'm willing to pay the outstanding fees but telkom has now added bank fees of R212 for failed debit orders which I'm not willing to pay. I think I have done more than enough to let them know about the new bank details. I've also had to pay R125 in bank charges at my bank for the failed debit order. Why must I pay twice for failed debit orders which I've notified them.