Bad service

I settled both my loans on the 10th of September 2021, on Monday I sent them proof of payment for both loans, I have been calling and being told that finance will allocate the funds and close the accounts, now I have being sent from pillar to post and the loan is still opened earning interest and now on the 20th will be debited for a loan that I paid on the 10th, I was told that this will be resolved within 72 hours nothing am so furious and taking this matter to the Obdusman. I am really not impressed at all and should my account be debited on the 20th I will take this matter to lawyers , because I settled my loans on the 10th don't understand why its still opened while I even sent proof of payments so the account can closed