Pathetic Service and Billed for service not used

I am being billed for a LTE service I cancelled 5 hours after I received the device. The LTE router does not allow you to use a different DNS server. The ADSL router does. I called in the same day the couriers dropped off my device and aerial. I called that evening around end of June 2015 and I asked to cancel my LTE. I told them not to cancel ADSL as it is used for business purposes. I have been trying to cancel since then. I am disgusted with the level of pathetic service I have received from both the call center operators and their Supervisors who either don't call back or puts the phone down in your ear. I have been to The Glen as well as Rosebank branch to return the device as they will not cancel the contract if you still have the router. The two branches will not take the device as it was ordered online. A courier needs to collect. The couriers don't collect so I have been billed for 6 months for something I am not using. I went to The Glen store on Saturday and just left the device in the store and took pictures of where I put the box. No one wanted to take it. Still waiting for Frans (Manager) to call me. I would NEVER recommend Telkom. I cannot get hold of anyone senior