Vodacom mistake not resolved

Vodacom made a mistake by migrating my wrong number. They did accept that it was their fault and rep**** that the mistake was resolved and a credit will be given. I contacted Vodacom yesterday and they cannot see any credits due on my account? I had to buy once off data and minutes this month because my number was not correctly migrated last monrh to a bigger package hence the reason why I had to upgrade my package. Now I have to pay much more because of Vodacom's Mistake. I have to pay for a bigger package on the wrong number and extra data and minutes on the correct number. I want this issue resolved asap.