20 gigs bought in error

After fighting with Vodacom for more than 3 weeks, the 20 gb of data that was bought in error was taken away as per my request and Vodacom said they would refund the amount of R999.00 to me. This evening I get an sms from Vodacom to say a credit note has been processed for the amount of R859.14. To my amazement I called the call centre to ask what happened to the other funds only to be told for the first time that there is a 15% penalty fee. Upset now at the fact that not one of the consultants in contact with me thought that it was necessary to tell me about this goes to show that the consumers rights act and being transparent with clients for an honest mistake is non existent with this company. Whats upsetting is nobody felt the need to mention this in the beginning I mean what kind of service is this. Just shocking . Cant believe being a Vodacom customer for so many years this is the way you get treated for loyalty. I mean you need to tell the customer upfront of the cost involved and not just expect them to know about this. Very disappointed and will be changing service providers very soon.