Do AliExpress sellers make less money if customers use discount codes?

I recently bought a product off AliExpress and I used discount codes from another site. The price of the product was £95 but I used the codes and got it down to £80. But the issue is that I’m missing many pieces of the product so i feel as if they purposely removed some items off the product as I didn’t pay full price. Idk if I should request a refund and ship it back out to them as it is too much hassle and I did really want this product. I messaged the seller to ask them if they could send out the missing pieces but they haven’t said anything yet. Did I get scammed or did they just remove pieces as they didn’t get the full price?