Vodacom migration

Good day. On 28/082019 I've bought 2Gb data. On 29/08/2019 I've received a call from a Vodacom consultant to upgrade my contract to a contract with better "value for money", but I will pay R200 more a month. The lady said I can still cancel the migration before end of this month, that is till 24:00 on 31/08. I was busy at that time and agreed to upgrade. Afterwards when thinking all through I came to the conclusion that the upgrade is actually not needed. So this morning 31/08 @08:00 I had to travel a far distance woman alone. At some stage I discovered that I don't have any data or aitime left. I then phoned Vodacom to hear what is going on and they said its because of the migration. When I wanted to cancel the migration the first lady said I have to cancel between 7 to 14 days, then she transfered me to the cancellation dept where they told me I can only go back to the old package after 3 months! Now because of the migration early on 31/08 they took all my data and airtime. I don't think it's fair as I've paid for it and I'll be without airtime and data for a full day, without any notification. Now that I want to cancel the migration before month end they refuse. I also didn't receive the new contract per mail as promised.