False Advertising/Disappointing

I have recently taken a laptop contract with MTN. The adverti*****t published indicated that "FULLY-LOADED LAPTOP DEALS THAT COME WITH A BONUS" . The bonus was stipulated in the form of pictures at the bottom of the page. I visited two stores, first one confirmed with me that this will be the case, I will receive the software(x3), bag, mouse, bag and gaming mouse with my deal. This particular store did not have any stock so I had to visit another store. I spoke to a very pleasant lady who did assistant and provided me with a sealed box and again I inquired whether these bonus items are a part of the deal, she confirmed that it was and that it is in the box. When I got home opened to box to find just the laptop and charger. I made contact with the sales assistant who provided me with these sort of whatsapp responses: "hi we emailed head office waiting for feedback on how will they send the deal" I tell her that she did confirm that I will be receiving the "bonus" items and her response was " Yes they were misleading on the advert. So I did escalate it but to state that" in another message to me' "They will message me back within the week most likely with the error and omissions excuse so if u want to cancel and didn't open or use the laptop and sim etc. I can ask my manager to escalate for cancellation". So is this how MTN operates, instead of assisting a customer or retaining one, do you just say you can cancel and leave, in my opinion this is very poor business ethic. I still want the contract as I have taken it for my kid who is turning 16 (birthday gift) but I also want what was "promised" with the deal.