Over billing

I recently upgraded my data contract. I was told that the new contract would cost me R129 which i agreed to. Upon receiving the first statement of my new contract i found out that the contract is actually R148 and there's a binding upgrade fee at a cost of R150 which i was not aware.

Iv been trying to get this sorted out but iv been referred to different departments which fail to assist me. I need to get this sorted out before the debit order goes through.

This platform was the last resort