They Keep Deducting Money off my Account After Cancelling Policy

I have now tried to cancel my insurance with your ******* insurance company TWICE! Since then, I have been billed twice by you worthless people for a phone that you would not let me claim for (which I don't have anymore!). I would like you to please cancel my insurance policy with IMMEDIATE effect and refund me the 2 months worth of Premiums you have deducted from my account. I received the "Cancellation" SMS from MTN Insurance on 7 September 2017 saying that my policy for (Policy Number: MTNLF ********** ) was cancelled for my iPhone 6. Please ensure this is so! This is extremely frustrating. First you don't care about your clients, then you ***** them over by taking 2 months worth of premiums even when I don't have the insured phone anymore!