Refusal of termination of contract within 7 days!!

I went in to the telkom office in Alberton to cancel a contact that was taken on the 2016/01/09. When I had gone in on the 2016/01/16, which is exactly 7 days cooling off period in which to cancel without any cancellation fees, I was notified by Lerato who is the manage of the Alberton office that I can cancel the contract as I will have to pay penalties as well as not accepting back the Huawei router B315 which was issue with the contract Smartbroadband Wireless 10GB, even after numerous calls to the call centre who advised me I can cancel it as it is clearly within the 7 day cooling off period. They have just given me the form to fill out and still refused to take back the device. The only reason the cancellation occurred is I have ordered an ADSL line with data with Telkom order no. ***A, so it's obviously not feasible to have both, as I have ordered the ADSL during the week before cancellation today. I'm not being lost by Telkom but gaining a product with a telephone line to make calls so please help and assist me with this query as the Telkom office in Alberton City Gauteng does understand my query and point blank refuse to accept back the device.