Airtime and sms cancelled with upgrade- uninformed

I recently upgraded my contract from smart talk you choose 4gb data. When doing so I was never informed I would forfeit my close to 500 minutes air time and over 900 sms. Upgrade happened today and all my saved facilities have been taken. I start with zero balances and cannot make calls from my phone. Told I need to add airtime, which I cannot do. Says phone not linked for this. I spend a fortune on my Vodacom contracts and this is the thanks I get. Will never upgrade a contract again, in fact will go to another provider. Feel ********** by Vodacom. And to top it all my phone is now useless. Great when I am a doctor whose cellphone is an essential item