Lastman's Bad Boy Superstore — dining table

Last week, i bought a dinnig tabe set from bad boy furniture and that was 7 pcs but in store was 4 chairs, and the man who helped me said we would send table to Toronto and they will add two more chairs. I accepted a and I paid . before they bring table my sister see the paper and she said they wrote 5 pcs and because I can't read English I didn't know that when I went store I talked to them and show the picture of the paper which wrote the 7 pcs but the first they said table counts 3 pcs after they said when you see 4 chairs In store you should to know it was 5 pcs when I told them it was paper on the table and wrote 7 pcs and the man who helped me said they will bring 2 more chairs they said we can't do anything and if we want to give you 2 more chairs you should to pay extra and now I don't know what should I do