Vodacom and Nimble grouo

Vodacom and Nimble Group are really messing up with my name (ITC). I have fully paid their account but up to so far they are claiming that they haven’t received my payment after 3 months, I have been recently reject a business loan because of this, I have called their customer car and even sent a proof of payment and paid up letter ( Provided by Nimble group ) but still no help, this is really affecting me and my business plans.