discussed at jet services

it's been 6 months that I have paid up my account... and just yesterday no1 at the store could help me with a paid up letter for my account asked them to gve me a number to phne and find out where I could go and get a paid up letter they told me they dnt know.... it's been 6 whole months that I'm waiting for a paid up letter just to clear my name.... so discussed at their services..... if any1 know how I can go about this plz help....!!!!!