Insurance policy cancelled - no refund on premiums paid

During November 2017 I requested a quote and took out insurance with iWyze. One of the conditions on my policy was that my car should be fitted with a tracking device. Tracking device was not fitted due to some issues experienced and I cancelled my policy end December requesting a refund on the motor premium as i could not utilise the cover I paid for. Call centre agent who finalised my insurance initially did not pass my details on to Tracker, which caused a delay for tracking system to be fitted and i had to follow up on this half way through December . On 5 January 2018 I recieved a letter from iWyze stating that my policy was cancelled on 6/12/2017 after they deducted my December premiums on 1 December. I immediately requested a refund a again. Numerous mails sent to their customer services still unanswered. I called call centre and after speaking to agent also requested a supervisor or manager to which i was informed the person will call me back, i am still awaiting that call back.