Pathetic customer service

I settled 1 of my vehicles last week Tuesday the 5th September 2023 and sent the proof of payment. The 7th September i called and was told to wait 5 working days for a paid up letter, which is today. I received an email today that i have to wait an additional 2 working days. I explained that i need the paid up letter for a job as i am not working but no one cares as long as they get their money but when account goes into arrears mfc threatens me and sends debt collectors. This is honestly inconsiderate. I cant imagine how long i will wait for registration papers if i cant even get a paid up letter on time.