OVER DEBATED ACCOUNT

I bought a laptop at Russells in April 2023 and my installment is R485 per month until Nov when I skipped a payment I then receive a call from Russells saying they will debit R900 in my account in December to cover my skipped payment which I agreed to .In Feb I received a call again saying I must pay R485 plus R300 to cover the areas I agreed to that .Today the 4th of March I revive a call again saying I need to pay R485 plus R300 again on the 5th of March 2024 which is not my debate order date when I asked why should I pay another R300 I was told it was to cover areas for the skipped payment in Nov 2023.I don't understand how R485 can get areas to more than R600 when I called the brunch management Mathapelo to explain what the nonsense is happening with my account she told me she can't help ,e over the phone I need to come inside the brunch so she can call the finance department but they managed to call me and told me all the payment nonsense without me being in the brunch if this is the way Russells conducts it self towards their consumers they can come and take their laptop or I will drop it off to the nearest brunch I don't want to do any business with Russells anymore and the last R485 you will receive from me I am giving you guys 7days to respond .