Refunded tax-invoice does not include the tax portion only the service fee before tax.

I pay Eskom directly for electricity. Every few months they overcharge and I have get them to refund and rebill. The issue here is that they only refund the service fees, never the tax portion. For example, last month they charged me R 1223. 22 Inc vat. This was incorrect. They refunded me R 1073. 00. And then charged me the correct amount + vat. How do I claim for the money paid in vat, if I even can?

I'm not sure if this is the correct forum for my query but I have no idea where else to ask. Thanks for your help.

We are unfortunately unable to assist you with this query, could you kindly call SARS at 0800 007 277.