Service is the PITS

I made a payment on the 20th of Friday and sent the proof of payment on that very same day. Since I used the incorrect reference number they had to trace my payment and allocate it to my account. The service desk number you get is useless cause they rarely update it. On Tuesday I was calling requesting a statement to at least show that I paid as I cannot wait 20 days for a paid up letter, I was later updated on Tuesday that my payment was received, I then requested a statement and I've been sent pillar to post up until now as they are awaiting for the finance department to update my account to paid. I need this statement urgently and all Im getting is NOTHING.