Paid up letter

For the 2 weeks I have been sending email and calling Lewis group to request a paid up letter for my account.

In the emails to their customer care email address I have also shared with them the direct contact detail I was communicating with when requesting for the outstanding balance so I can pay it off and they have still not got back to me.

I need a paid up letter to clear my name not even one person is responding or calling me back.