I receive no feedback

I have requested by Policy with Miway to be cancelled via email on 28/08/2015, no confirmation was given via email as I requested, Miway, I have had a couple of calls missed, but have no idea if it could be Miway because no voicemails are left, I have not once received a call on my landline number which Miway does have, as I cannot be on my cell at all times during the day. I have sent follow up emails on 02/09/2015, and 09/09/2015, I logged a call me back request on their website on 08/09/2015, but have not received a call. I requested my policy to be cancelled effective 30/09/2015 as I am moving to a new insurer, i will not take responsibility for another month's premiums because of Miway's neglect to answer my queries as i have requested a cancelation in writing more than a full calendar month before the cancellation effective date.