False adverti*****t and ******** of people is simple nowadays!

FALSE ADVERTI*****T! I've been with mtn for more than 5 years now on contract, and I have upgraded several times. I recently (December 2019) upgraded over the phone by dialing 135 as the customer care number. I chose a laptop upgrade that had a monthly repayment of R319 and i will be receiving a 5GB day and 5GB night and will receiving a once off 30GB data for free as it has been happening with mtn for years. To my surprise when i recieved my statement i was billed R429 and when i called to enquire, i was told i am being billed for the once off data that i have recieved, with that said regarding the stated data, i could not use it because they told me only YouTube data is remaining after 10GB was used and if i wanted to use the remaining data then I need to remove the simcard from the router and put the simcard to the source... Meaning the laptop. But the laptop has no simcard access. How can they expect me to pay for something that was advertised as free and on that unable to use because it's a router simcard. ******** people has reached the highest level even from the once trusted service providers.