TERRIBLE service

I've been having a terrible experience with MTN and Samsung. The Samsung Galaxy S8 was advertised over the black Friday weekend with a free 256GB micro SD card. I was told at MTN Chatsworth that the SD card will be delivered within 3 weeks. It is now approaching 3 weeks and I have had no feedback regarding this. Whenever I call MTN, they give me a number to call which has to do with MSC cruises, when I call them, they tell me to contact Samsung directly, when I do that, I am told that this is an MTN querie and I should contact MTN. I have been going around in circles for the past week. I leave the country on Monday morning at 5am, I need this matter sorted out before then. I don't expect to be paying R599 pm for a phone and being given this kind of treatment. If MTN and Samsung have to look back on this account, they will find that I have purchased 5 Samsung devices over the past 6 - 8 years. I really DO NOT appreciate this service being a loyal MTN and Samsung customer.