Vodacom Online Upgrade

I was contacted by a Vodacom migration agent to add more minutes to my contract and was told that when I upgrade it will have no effect. Later that day I did a online upgrade with the black Friday deal that they had. Since then the deal I upgraded to showed it had been processed. They have however now removed it from my online portal and every time I phone to ask what is happening I am told that the deal wasn't processed because of the migration. It feels that Vodacom is more interested in being dishonest and charging the same for a contract I dont want, than honouring what was said with the migration salesman