Adverd running but you cannot get it for that price

I saw an add yesterday morning on Youtube of the Huawei Y7p for R3499 +bluetooth headset+16 g Memory card + R100 Nandos voucher. I went in to the store to check it.Later on the day I wanted to go and check it again but could not find it for that price again nor the video. I called Huawei to enquire about it but was told it could have been removed during the day as it was only for the first 200 customers.So later last night the add showed again on Youtube .I recorded the add on the screen .So my question is why are u still running the add but the phone cannot be bought for that price?