Migration

I have written to you before about the migration that was done by a vodacom consultant. They did investigate and they told me that they will credit back the money that said I owe. I'm still getting messages that I'm owing them while I've been always paying them. Today it was a stressful day for me as I had to call the rewards department with my own money. They told me that I have been credited back but when I call their account department they say I'm owing them. I'm so frustrated and I don't know what to do now