No understanding of a cancellation

<p>I submitted the cancellation letter in order to have my landline service cancelled, in February for the first time. (Note that I diconnected the phone, so it has not been in use at all). I have since submitted it every single month. They still continue to deduct money from my account and have not cancelled ********** 018. I'm beyond annoyed and want a refund for the 3 months they have already deducted. </p>