FNB Connect False Advertising

It baffles my mind that a big Corporation like FNB still has a poor customer service via their portals, secure chat and call centre.

And to top it off, luring in customers with promises of promotional data but then deliberately hiding conditions in their T's and C's (which is not stated in my agreement)

Bought a new device through FNB connect in Nov 25, with a promotional data of 500gb a month for first 6 months.

Only receiving 10gb

When I query it, I am told the promotional depends on the monthly amount you pay.

This is not stated in my agreement with FNB connect, but rather somewhere on FNB website. I did not agree to terms hidden somewhere on the website, and during the application process, no such document was provided explaining this "terms and conditions"

********* actions?