Afrihost Subscription increase

Afrihost tried to debit my bank account for the monthly fibre package only it did not go through today. All of a sudden without any notification the package went up from R597 to R667. And when you go through to the payment site it adds up to R687.

I’m not paying that amount when I signed up for R597 a month and I won’t be paying the penalty fee because they couldn’t debit my account due to the fact that it increased out of no where.