Failure to keep promise

On Thurday the 14th I received an smsfrom Vodacom reading:Last chance to get 1GB (valid for 7 days) of FREE data from Vodacom. Recharge with R12 before 15/12/2017. T&Cs Apply. Opt out? SMS STOP to 31118

Quickly, I recharged because, well I need the data. But Thurday passed no 1 gig, Friday, still no data. When I called them today, Mpho tells me I should have gone to my app ...and... and ...and, to get my 1 gig .And since I did not do that there's nothing they can do and I have lost my data. Now my gripe is nobody told me about anything else except recharging to get my free 1 gig data. Which I did. Now I feel I have been conned to recharge with a promise to get free data. And now that I have recharged I am being told I should have done something else which was never mentioned in the initial sms.

What's going on here? Is Vodacom running a ****?