Finchoice loans

I took a loan with Finchoice on December and it was due for 6 months . On April I decided to settle the whole loan and I did so and paid all the interest needed according to the settlement quote provided . Few days later I received a call from one consultant who told me my debit order was due . I explained to her that I have already paid up the loan and she had no idea ,which is very unprofessional of them .

Fast forward , I received a payment from someone I know and when I got to the shops my card declined only to find out they have debited me .

Firstly I paid all their money with interest . All their money ,how come they deduct money from my account . Yet on my mobimoney app it's a zero balance to show I've already settled the loan .

T