TCF, Incompetence

I hade an account with the bank due to their *********** I switch banks and they called me and told me that I owe them 600 which I made arrangements to pay it in two months. I kept my promise on the 27-01-2019 I paid and amount of R300.00 I was given an email and fax to confirm payment. I emailed proof of payment to date I have not received acknowledgment of my payment, no phone call. I don’t know how much am I owing and how do I pay the balance if now one calls, but before the payment they were calling, this is wrong they just still from me ?