Incorrectly Billed For Data Bundle

My account usage for February 2016 (billed on 1 April 2016) reflects the purchase of a \1GB promotional data bundle\" for R249 (vat inc). This is despite me not having purchased a bundle on this billing cycle. I escalated this through the call centre following which a complaint was logged. It was \"resolved\" speedily but the account still reflects the incorrect figure. I engaged Vodacom twice after this and the problem is still not fixed. <br> I refuse to pay for a bundle I did not purchase. <br> I understand that errors occur but surely it should be possible to fix them with 1 interaction