Disregard for clients and loyal customers

I have been a loyal customer of MTN and Samsung for years now. I purchased an S9+ from MTN last year and I was happy. I purchased the S10 today, which was 2 days over their earbud promotion. I was under the impression that I would still get it as the process began prior to the end of April. Samsung completely dismissed me and arent willing speak to process this earbud promo for me. I was never going to consider the iPhone X as this earbud deal was a winner. Now that it has been made clear to me that Samsung do not wish to keep their clientele, I am probably going to return my device and switch over to a more co-operative brand. I wish MTN and samsungcared more about their loyal customers than they did about their rigidity.