Bad service

I made arrangements on the Nimble group website according to the discounts offered on 3 of my accounts. Received a paid up letter for 1 and was told the other 2 are referred to a different department. When I checked online, the 2 accounts still have a balance yet I paid in full according to the discounts offered. No one is responding to my query and am long waiting for my paid up letters. I have a job offer that I can lose because of this delay.