Stressful and unfair

I received mails from bonitas to submit my income verification and i did so and i was left with my IRP5 which at the time i could not get due to company troubles and as such i was told to submit an affidavit of which i did. i was deffer-ed to the highest income gap or whatever its called regardless of them still seeing my payslip as proof that i can not afford to pay that much and a dozen calls to them informing that i can not afford it, regardless i'm still scheduled to pay that high price for FEB even though i have submitted everything before the 31st. how can i be able to pay that much money when i'm already battling to make ends meet on a day to day. and the reason i took out that plan is because i know that its the only option i can afford. its sad that I've been happy with them until now and no one is willing to assist me.