Exceptionally disgusting customer service

I received a wifi router on contract from Cell C on the 21 of July. I received the device and proceeded to set it up. The network coverage in my area was extremely horrible but i went through the trouble shooting procedures but after two days decided to cancel. I was told that the device would be collected withing 7 working days after which it has to go through a 7 day analysis and only after this the contract can be cancelled, I accepted this and waiting 7 days. I called Cell C on the 6th day to check on the progress of my cancellation request and when they will be collecting, I was told by the agent that the 7th day is only the following and and i need to wait it out. I did, and now 3 weeks later i am still sitting with this device. I have been calling Cell C everyday for the past 2 weeks and every day i was told they would arrange immediate collection but they never collected. I tried asking for a manager 4 times out of which 2 times the call was dropped on me and the other 2 times i was promised a call back that i am still waiting for. I have never been this disgusted by customer service in my life. All I want is this contract canceled immediately!!!!