Delayed paid up letter

I made a payment 2 Shapiro shaik attorneys on the 22nd of December. I phoned two days later to confirm if monies were received and I was advised the money was received and allocated when asking for the paid-up letter I was advised it needs to be requested from nimble and the paid-up letter will be sent after 21 days. I Find it very amusing as payment is allocated and the company I was owing money to have no idea that the account has been settled. I demand that my paid up letter is sent to the company and my record be updated. The 21 days is ridiculous and therefore I want the letter sent to myself urgently and my credit record updated. I would appreciate if someone were to get in contact with me to get my details so I can get my letter. I will escalate this matter to the ombudsman should I not he assisted.