No authority to debit

good day,

I took a new phone on line and i was debited an amount of R200.00 and yet i was not advised that there will be an amount i need to pay for me to make arrangements.

i called in and i told them that that they can either way submit debit and i am not liable for the penalty.

i was told that i wont pay the penalty but im still receiving sms that i owe about 100.00

this is affecting my credit.

please fix your mess