Incorrect premium taken, pathetic response given!!

The cost of my cell phone contract is R208.50 including the CLIP service of R9.50, and the cost of my Wi-Fi/data contract is R99, therefore the total amount that I should be debited is R307.50, but on 29 May 2015 I was debited R317.50, which is exactly R10 extra. I then emailed Vodacom on 31 May to query this, I then received a pathetic response from someone who cannot read and could not investigate my query thoroughly, this person incorrectly responded to me stating that I was debited R9.50 extra for the CLIP service, this is unbelievably pathetic, I want someone who is competent to look into this and refund me my R10. This was Vodacom's mistake by debiting me the incorrect premium, I had to waste my time emailing you and now I must waste my time again posting this complaint because your consultant couldn't do her job properly... EXTREMELY FRUSTRATING.