256GB memory card promotion, only received 64GB memory card

My upgrade was finalised in the beginning of August during the 256GB micro sd card promotion with the Galaxy S8. I only received my parcel more than month later with the incorrect memory card. I take this as breach of initial contract. Upon calling MTN Direct, I was "transferred" where i has to wait an hour-and-twenty-eight minutes and decided to **** the call. I called again and got through to someone, asked to please not transfer me again because of waiting so long before, he had a bad attitude regarding what I said and explicitly told me that he didn't say he is going to transfer me, then he actually does transfer me. It is just non-stop incompetence. There is a R 2000 difference in the price of the memory card that I have received. At least after calling every single working day for more than month because of no delivery, I would've thought that I would be able to get the correct things with my order.