Incorrectly billed for three months in row

I have being incorrectly billed for the three months in a row - I was billed for roaming in and using data whilst roaming - which is untrue ,I queried this in the beginning on February and I was told that some one will contact me they are still investigating the matter - a month later no one has being in contact with me - Ive emailed the Vodacom complaints - no one has being in touch with either ,I personally phoned Vodacom several times and I get passed on from department to department ,and the worst part is no one has being assigned to my case - so all I have is a mere reference number ,which doesn't seem to be ably to solve my problem .This morning alone trying to sort this out Ive being given three numbers and no has being to help me .Ive phoned ***.<br>