Migration fee payment

Good day, I requested a migration from my Vodacom account two months ago, they have forwarded a Quote request to me for a payment of R575.00 to activate the migration. I paid the amount the same day at the Vodacom shop in Wonderpark centre and since then they add this amount to my bill each month telling me I am in arrears of this amount. I visited the Vodacom shop several times, called them and went back to the shop again, then I spoke to a consultant in the migration department who advised me that I needed to pay R1200 instead of R575.00 I explained to the consultant that Vodacom have sent me the Quote for R575 only not R1200 which was paid, she advised me to forward the POP to them which I did, they sent me an sms "Thank you for paying your Vodacom acc" I thought thank goodness this problem is now solved. The next week I received sms 's and calls again that I need to pay my arrears account for the amount of R575.00. I am really getting fed up with Vodacom now as we are back to square one again and this R575 is being added to my bill for this month again!