very bad ? service

Huawei R216 Router. I app**** for this device and was delivered to me on 17 May 2017. In the contact they said if you are not satisfied with the product you can cancel in 7 days, so I did on 24 May 2017. So I phone the number that was given to me and cancel the router. But my account is still open with them and the product wad picked up by one of the delivery trucks. And they start with demanding payments for a product that's not with me anymore.