Bad customer service

I had a loan with capfin which was supposed to be paid off in Feb but due to some financial problems I finished it in March and there was penalty fees of R460 which I paid on 27/03 via EFT . On the 31st March I got a call that pmnt was not received. I told them I have aid and whilst on the line I send them the Proof of pmnt and realized that I haven't written the reference nr. The consultant gave me the correct ref nr. Now I'm having endless calls now the balance has increased because the pmnt is still not allocated ..