Frustrating application process

I've been a loyal customer for more than a decade, and have 4 existing contracts (last one taken in March or April last year). Needed an additional line so app**** for another contract at the Vodashop in Promenade. Zeenat helped me with the application (she's brilliant by the way, this complaint has nothing to do with her) but the guys doing the credit checks needed 3 month's bank statements. Standard requirement I guess, but this morning she calls with feedback from the head-office or wherever these check take place, stating that I can only apply for another contract in 90 days because they would like to see the how I conduct the existing contracts. How on earth would another 3 months make any difference!? I've conducted myself pretty well for the last year in which I've had these 4 contracts... what else do they need to know? Really pathetic! Cell-C, here I come...