Pathetic Service - Pillar to Post

I have overpaid on my Vodacom Account since last year September, so i called in to get a refund. Logged this query on the 17th July, sent through proof of payments as requested even got confirmation of receipt. Call again on the 2nd August, now being told my query was closed because no proof of payments were received...then all of a sudden "oh they see them" please speak to payments only to be told i am owed R800 when the online statement says R1300 (oh but i should NOT TRUST that statement - its not accurate). My online statement seems to have vanished off my profile aswell by the way but fear not i have a copy!!! Today is the 14th day in which i was supposed to receive my money, i call in & still "No proof of payments were received". Does anybody at Vodacom know what they are doing. I WANT MY REFUND & i will not be taken from pillar to post ,because as soon as a person is late on payment you hound them like dogs.