Staff have no idea what they're doing, now I sit with a contract I can't use.

I went to the Vodacom shop at Hypermarket, Brackenfell as my contract expired. I explained I only want a new contract if my roaming will not be affected while I'm overseas. I need to receive sms's and OTP's for my bank cards. They assured me nothing will change and I'll still receive sms's. They continued to change settings on my phone which I didn't ask for and again I said it's important that I receive sms's as I have always received in the past or they mustn't make any changes. I'm now overseas and I cannot receive ANYTHING! I can't use my data as I use to either. I've switched the roaming on via the Vodacom app but still no change. I don't want to buy bundles as I have an international nr as well, so I use that which was all explained. This new contract is now of no use to me as I can't use it for the one thing I need it for, which is to still receive sms's.