Where is my refunds which were due in June, July AND September?

I purchased data through the Vodacom app (R149 for 1gb) in June I was charged R388.68 and dealt with a Mbaali re # ********** ********** 0. In July I was charged R259.12 and dealt with Loratto and then Connie the supervisor # ********** ********** 5, she gave me her e-mail address which mail has never been delivered to. Again in September R259.12 and dealt with Simpiwe and then David Nyembo who advised he was able to see all my queries and could not understand why I had not been refunded. Took it up with the site specialist in billing and was advised the reversal / refund would be seen on my October invoice. Even gave me his cellphone number which I have been unsuccessful in getting through. I have just received my November invoice and NOTHING ……………… who do I need to talk to get the R459 that Vodacom has over charged me?