Call centre hangs up on me

Good day. A while back I went into store to cancel cellphone insurance. I was told I need to phone. It is impossible to cancel the insurance since the call is ended everytime from your side. I phoned four times this morning. Two times the call ended before even getting through to the agent. Two times the call ended while speaking to an agent. I want my insurance cancelled today. I received a letter from you saying the insurance will go up on 6 April. I only received the letter a week ago. I refuse to pay this new high amount. You could have emailed me if you wanted me to know on time. As for my shopping at Edgars: I am done. I can't even cancel account protection. You do clearly not care about clients. Cancel my insurance today. Thank you.