Over charging

I have a credit card with them on the 7/02/2026 I made a payment of 800.On the 19/02/2026 called their help line that I want to settle the remaining amount the lady gave me the amount I must pay and I asked the lady to make the payment the next day.On the 20/02/2026 made the payment of 15000 which settles it.But now when I look at my app I still have a balance of 1670 which I don’t know where is it coming from.I have been calling trying to find out where is the remaining balance coming from the last lady I spoke to said she will speak with the manager and get back to me I have been waiting seen then.