Bad in Communication

My last payment to Hi-fi Corp is one big mess, September 2018 they tried to debit R859.05 from my account without any arrangement. Finally a guy phone me and explain to me the amount of R859.05 were supposed to be debited end of September to make it my last instalment I informed him that I were not informed therefore I did not have the said amount available in my account. Arrangement was made that Hi-Fi Corp will then debit the R859.05 from my account end of October 2018. End of October 2018 they only debit R515.54 from my account, yesterday I receive a message that state Mr M Boshoff you have not adhered to our payment arrangement. If no payment is received, additional charges will be added. I really fail to understand why Hi-Fi Corp want to bill my additional charges if they did not debited the arrangement amount so it’s not that I did not adhered the failed is with yourself. I even told the guy that phoned me yesterday that he is saying that the call is recorded therefore he needs to go back to the conversation we had early in October were I agree that Hi-Fi Corp can debit the last debit order from my account at the end of the month. I receive smsse that I Need to pay the outstanding amount of R343.51 but not payment method is send. According to him I cannot make payment at a branch so were must I make payment of the outstanding of R343.51, Hi-Fi Corp cannot charge me additional charge due to the failed were not with me because I made sure that the funds for debiting R859.05 were available for the end of October. It would be appreciated if you can advise to where I can make payment on the outstanding amount (R343.51), in order for me to have my name in clear.