vodacom contract airtime stollen

I have canceled my vodacom topup contract a month in advance as per there requirements. On the 30/07/2018 which was yesterday my topup AIRTIME balance was over R700 of vodacom AIRTIME. Today i wake up to prepaid to my surprise hassle free from contract to prepaid vodacom finally got something right.......NO check my airtime balance R3 ****************. Call in to retentions where they would advise that your airtime is forfeited when you change plans like moving from contract to prepaid.......amazingly. like your data that expiers how ridiculous. from vodacom to vodacom your airtime disapears how HOW. They give advice that i should have been told when i canceled so that i could have used the airtime during the month...USE just for no reason other than not loosing it. Like using eveything in your home because the ***** planning to do a ******* at your home called to say his coming the end of the month. UNFORTUNATELY this ***** didnt even advise me that this is there policy when i canceld.