High bank interest rates

Few years ago I joined capitec Bank and found it quite amazing, easy to use and reasonable. I am getting my salary there, since last year I have been complaining about their hidden costs of which I have found that it has somehow become little expensive for someone who uses an account frequently. I had two loans with them and credit card included, then I took money from the bond to close one account which I saw that it wasn't moving. I was owing a certain amount of money, then few months ago I saw that they said I was owing higher than what I was shown before [or after payment]. I went to two different branches to enquire of such and the answer wasn't even satisfactory, they said that it was interests which went up, mind you according to the loan term I had finished paying off the interests, now I'm paying the actual amount which I borrowed. Today again, I see that I am back to that same amount which went up and back in my mind, I guess the answer is going to be the same that it is the interests which went up.

Can someone with a better clarity educate me about this whole situation because I'm up to here with this bank and I'm moving my salary to another bank, I can't deal with such whereby one is going back and forth with the debt. We all want to see ourselves out of debts eventually but seems like we are being ****** day light by this capitec.