越式米紙沙拉 1 个

I paid for around $40 and each pack suppose to contain 3 bags, so I expected to receive more than 15 bags, instead I opened this and HAVE 6???? IN WHAT WORLD is this right. the other time my friend bought 2 packs and she received 4 bags instead of 6, so I thought maybe this wouldnt be so bad so $7 but why am I only received 6 bags after paying $40??? I should get at least 12 bags