*****ulent debit, by lying on record

I had arrears of 18000 and one of the Nedbank employees called me and advised that if I settle the areas I will qualify for 30% discount and the settlement letter will be issued. I did that and she even called me back to advise me that they see the money was deducted as agreed and the settlement letter will be sent to my email. After a week or 2 i recieved a call from Nedbank again asking me when am I willing to settle the balance and she advised that there is no way one of them can call and offer a discount and even follow up with a call to say thank you for making a payment. Yo my surprise, all of them call with cellphone numbers and not landline. So I was *****ulently debited.