Not getting what was promised before migration

I called vodacom 111 on 17 may to enquire if i could migrate to a different package. I have two contracts with vodacom and wanted both on the same package. I repeatedly asked if it would be exactly the same, including the data. They told me that it would. R200 Airtime and 1G data. After migration i only got 250mb data and R200 airtime. I phoned and they said that the first package was a promotion and they dont have it anymore. I told them that i spesifically asked if it would be the same and they said yes. they said they would check the voice records and come back to me. If they promised that on the recorded call i would get it. I havent heard from vodacom since. The reference they gave me on the second call 383 006 748