Impossible to Cancel Simsure

Called 111.<br> Held the line for 3 Minutes before i could speak to someone<br> I informed them I wish to cancel the Sim Sure on my contract.<br> I was then told that it cannot be done and i must be transferred to Insurance department.<br> Then help for 10 mins<br> Then told by Wendelene that I must go to the store to do this.<br> <br> Once Again i been beaten by the call centre.<br> I give up.<br> Please tell me the secret to cancelling the sim sure.<br> <br>