Very appalling and misleading service

I purchased a router on Tuesday 30/10/2018 and to my surprise there isn't any network coverage at the area I live inn so I decided to take it back on the 01/11/2018 as I cannot use it because of this coverage issue only to be told by Bakang who is a service agent there that they can refund me when actually he told me on Tuesday that I can return it within 7days, not only did he not explain that they don't refund on devices but he actually said I can return for a refund within 7days. Their service is soo appalling and not satisfactory as they mislead customers by not giving the the full terms of non returning of items, I want my money back I left the device at the store and I will only go back for my money. I'm sure the Ombudsman will assist me further should I not get any assistance on this platform