Nhờ sửa bài giúp

I have lived in foreign country and one day I was in a shop and I liked a pair of sport shoes, when I asked its price to shopassistant, he said 90 dolars, I said I have just 30 dolars and I was telling truth, He didn't accept my price that I offered. at the time of I left from the shop , he sait from back of me , Ok bring 30 dolars and take these shoes.

I was suprised and went back to home.

İs there anything in this my remembrance I have written wrong ?

Correct them please...