Wow! fantasy world...Bank statements? Proof?
Anyway back to reality....One of the major reasons numbers don't tally (In any other TU branch) is that many people cancel their membership with the company by stopping deductions but don't tell the Union as they don't think they have to.
Because the deductions go to a central collection of the main Union it can take some time before things are sorted out and those who have not resigned in writing are spotted....