Misleading Advertising and inefficient sales reps

I upgraded my contract with MTN South Africa via their call center platform based on the advertised S24 Ultra that was launched and upon receiving the product and up and down for more than 2 weeks now I'm being told of in-store upgrades versus on-line upgrades and codes that's not the same after clearly stating when I upgraded that the advert I'm seeing is what I want and will be paying. This really sucks as I'm now paying the same monthly premium as someone that upgraded in-store without reaping the benefits of the charger and screen protector that I was suppose to get with the device. PS, thus after I wanted to gi to store but was advised that the on-line platform would allow me to do it immediately and also this after calling me non-stop to do this upgrade