Overcharge sfor more than six months upgraded contract instore and upgrade didnt happen.

Vodacom has been charging me on a monthly basis Since end November when i upgraded a current data contract of R299 per month now R1309 per month so it is R1000 more and after numerous emails and instore visits thy promise to sort it out and give me the overcharge of R6000 now back. nothing happend and i had to cancel my current contract and wait for another month. So i will be r7000 out of pocket. I upgraded and thy never processed my upgrade and when i picked up on my next month conrtact that the fee is now r1000 more thy said thy do not know what went wrong but the deal i signed for is not available now, but thy will pay me back for the overcharge and give me another deal which will be more expencive. i have sennd multiple emails to store managers (more than one). went instore to sea the store manager which said thy will sort this out and up to date 5 months later nothing happend. my wifes number is on same account and if i stop to pay then thy will stop her number so that is not an option. After thy convinced me of her number which i also upgraded the same day is going to be r200 per month more because of there fault i am paing r200 a month more for that but didnt received the credit for the initial 2 months overcaherge.

Please do not use these *****sters. I have all the emails and can proof all.