Paid up letter & closure

My account was settled 2022-05-19 via eft,and was then again debited on the 2022-05-20,I called in to request paid up letter and was advised funds are not yet reflecting on the account, I need to emai proof of payment for funds to be allocated, have sent an email on Monday 2022-05-23, ever since I haven't received any response, when I call in they keep on telling me I have to wait 48hrs as it's the turn around time, I'm getting really frustrated because I want that account to be closed and be provided with paid up letter, but no one is acknowledges my request and I will then be charged interest on that account I want to close.I have been sent to pillar to post, even called again today was told I need to wait another 48hrs

Can someone please reply to this