Black Friday

Hi..I buy tv hisense 40A5700FA  on 15th November from santarem store. They said to me that i will recieve this in my house  in 2 to 3 days   and they apply the rate 369.98.I still didn't recieve tv and it's price is less now.How i can get this on low price should i cancel the order or something else. Please guide me.Thanks