Settlement letter

I've been struggling with getting a settlement letter for a temporary account since August 2016, and emails sent to Patricia Holland, your call centre and debt collection companies have been met with unhelpful attitudes from all the people I've worked with.

My email to Patricia: Please can I ask you to send detailed/itemised explanation of what these accounts are for – I’m not sure I have these reference numbers somewhere to reference? I had a 622 cheque account number with you, attached to that was a temporary loan, which needs to be paid. This is what I’ve been battling to pay ever since I spoke to your organisation last year August. Also, please may I ask you to send these to me on an official letterhead, showing where I need to pay – who needs to be contacted once payment is made? I have to point out that the lack of service and respect for how customers are dealt by the employees in your organisation is appalling.