Call centre not answering/ sim and/or device not working

On the 30th of October 2017 I took out a contract with Sell Direct for their mifi router deal that they are promoting. Devices were delivered on time however activation of sim is not happening. Trying to phone to call centre yet no one is picking up. Spent close to an hour yesterday and another 1 this morning trying to get through. This is unacceptable service to paying clients.