Poor service

I had the worst service at Coricraft Cresta and their head office. I have an account with Coricraft and I decided to pay it off and close the account. They told me after paying it off I need to pay a settlement amount which I don’t even understand what is it for because the account I opted for was 6 months no interest. I paid it off now I want to pay the “ settlement amount “ no one wants to give me the amount. Paid on Friday they told to come me on Monday to check the settlement amount as the amount paid takes 24 hours to reflect on the system. Monday I went to the store they called their head office I was on hold for about 30 minutes only to be told the amount is still not reflecting. I was told they’ll call me on Wednesday regarding the settlement amount. No one called me, I went to the store again on Thursday they called head office I was on hold again for about 20 minutes Only to told again that the amount I paid is still pending therefore they can’t calculate the settlement amount. I am not happy at all with the appalling service I received.