Poor service from Vodacom

So I was passing Mall of the North and bought an SD card there, only to realize when I get home in Joburg that I bought the wrong card. I went to the nearest Voda stores with intentions to exchange to the right SD card or whatever product of the same value if they don’t have what I want, only to be told that these stores are franchises with different owners and no store will help me exchange this SD card. Basically I must drive 350km back to Mall of the North to exchange or for refund. What nonsense is this? I called Vodaworld thinking they are the centre of the business and engaged Vodacom even on Twitter all to vain. They are just not willing to help. How difficult must it be to exchange a mere SD card? This is just all trashy