Refund differences and not paid as agreed

I had an issue with billing and I logged a call with Vodacom.<br> <br> The one operator agreed to a refund excl vat of R 3678. The next agreed to a full refund of R R 4535.33<br> <br> This morning I received a payment of R 3852.83 from the first operator. This doesn't even tie up to the amount she gave me.<br> <br> I want the full refund of R 4535.33, as I still stand on the point that the time on the detailed bill there was no one home to even use the data.<br> <br> I will take this to the umbuts man if this is not resolved. I have proof that no one was home to use the data at the time the data was used according to vodacom.