*******ly charged out of bundle data rates

On 25 Jan, I noticed that I was being charged out of bundle data when I still has data remaining on my account. I queried this via Twitter with customer care. I had no response. I again queried it on 1 Feb, again with no response. On 28 Feb I again queried it and ask for action. Eventually got reply on twitter that the matter was being investigated. I received a generic message this afternoon stating that they investigated it and confirmed I had used the data and therefore must pay. I never mentioned data usage in my query, only the fact that I was being charged even though their own vodacom app, as well as *111# confirmed that I had 200mb data left. They are refusing to answer why they billed me for data when I had data left over. I upgraded my contract in December and that is when the problems started. They are trying to bully me into dropping this through sheer frustration, but I will pursue this until I receive a refund for the ******* charges. I am currently investigating my rights in terms of the Consumer Protection Act. I suggest all vodacom contract customers check your monthly invoice thoroughly. They could be siphoning money from millions of customers monthly!