Charged for services not rendered

On 22 April I visited TWT Menlyn for a puncture repair. On receiving my invoice via email I noticed that I was charged R52.17 for wheel balancing. My tyre was NEVER balanced! My vehicle was the only vehicle in the workshop so stood watching most of the repair. The one technician even asked if the wheel had been balanced and the other technician said no it wasn’t required as he marked the tyres position on the mag and replaced it in the same position. My dashboard camera was recording continuously for the entire 45 minutes my vehicle was in the workshop and had a clear view of the entire front of the workshop, including the 3 wheel balancing machines. I feel disappointed and cheated. Its not a lot of money but the dishonesty disgusts me.