Vodacom refusing upgrade due to Debt Review

I am trying to upgrade one of my contract I have with vodacom. I am currently under debt review, and now Vodacom is declining my request to upgrade. They upgraded my cellphone contract before while I was under debt review, so I don't know what the issue is now. I have never missed a payment. so nobody can actually explain to you why this is done. My cellphone and data contract is not part of the debt review contract as it falls in as your monthly expenses. As I explained I have never missed a debit order and Vodacom is discriminating against people that are under debt review. This is no way to treat a loyal customer.