Extremely incompetence with in Vodacom Accounts

It's been 3 months now that I have been dealing with extreme incompetence at Vodacom Accounts department. In June I requested a migration on my data contract from Mygig2 to a Mygig5. I was emailed a letter stating that the price would be R788.99, however on the phone they stated the price would be R259. I called back and the gentleman I spoke to assured me that its only an out dated letter and that the billing will be done as per the call price. In the middle of July I ran out of data and couldn't understand how that would be possible, after logging in and checking my balance I notice that I was only allocated 2 gig. I phone in and they did another migration, this time round it was done correctly, I received my June invoice and there it was... I was billed R788.99 for the Mygig5 I never received. I called in and explained to the lady in a soft decent tone what happened and that I will not be calling and calling to have this resolved as it's not my error, I was assured again this will be resolved, I'm still trying.<br> I cannot understand how it this difficult to have it resolved<br>