Poor service and incorrect data amount

I’m so annoyed with Vodacom. I renewed my data contract last month to 200gigs night data plus 200gigs day data. I went on the Vodapay app to check my data balance. They loaded the wrong data amount. They gave me 40gigs instead but they are charging me double the amount. I’ve been calling Vodacom to try to fix this but they keep on giving me different numbers to call. This is frustrating