HARASSED VIA CALLS EVEN THOUGH ACCOUNT IS SETTLED AND NOT SENDING PAID UP LETTER

I'm utterly disappointed and annoyed by Nimble. I took a settlement offer and settled my account exactly 28 days ago. They are now harassing me and calling me twice a day asking me to settle my account. How is the settlement offer agreement not visible on my profile? and why are they still expecting me to send proof of payment when they deducted via debit order? I'm waiting for a paid up letter and not all this nonsense you're doing. And I don't care about an automated response that's going to say my account will be on hold for 24 hours. I just want the matter resolved, send my paid up letter and stop harassing me.