Poor Customer Service

I had the worst experience from RSAweb customer services. I canceled my services and was advised that I would pay around R2400 for it. This was confirmed to me over the phone and email as well. I accepted the agreement and and also responded via email. Now the agent has come back and stated that he made a mistake to add additional hardware which the cancelation total amounts to Around R3200. This is unacceptable it costs me already so much to cancel the services and the agent still makes these big mistakes, on top of that he doesn't even apologize for his mistake. I honestly refuse to pay that extra when I commited to an amount and agreed to it. I will not be referring RSAweb to anyone for poor customer services. Really bad service received.