Non-Disclosure SMC plan Samsung S8

Hi I bought a Samsung S8 on the 14th August 2017 at the MTN store @ Midrand boulders complex under installment sale agreement and I was not informed about Samsung Mobile Care plan by the consultant. From my understanding the duty of a sales customers is to inform the customer of the product features and benefit which comes with buying the products from the manu****ure. This is poorly selling from your partner MTN store-midrand, now I lost cover benefits for my screen (R69 p/m). I was only notified about the cover which is provided by man not Samsung. Who was supposed to inform me? How the he'll was I supposed to know ? I need my screen repaired as you've failed to disclose the cover plan which was on promotion. ON PROMOTION. I'm only learning about this cover today on the internet.. I will not have this