Never again fishaways n1 city false promo

We just placed a order with fishaways n1 city for a hake pot. The promo shows buy 1 get 1 free. We place the order for 3 and they deliver 3. So what happened to the other 3. Is this false advertising.. Buying 1 and get 1 free. My understanding we bout 3 so it's supposed to be 6. As per they promo ad. Just a pity I can't upload the promo