Can I please get an update on my paid up letter

I'm extremely dissatisfied with the service I've received. You previously informed me that I could settle my debt with a one-time payment. However, it's been a while since I made the payment, and I still haven't received my paid-up letter. I'm finding it unacceptable that there's been such a significant delay. Could you please look into this matter urgently and provide an update on when I can expect to receive my paid-up letter? The wait has already exceeded 48 hours, and I'm growing increasingly frustrated.