Discovery Slacking on my Cancellation Request

I've had no issues with Discovery Insure in the time that I've been with them but I'm finding the cancellation program to be a bit of a black hole.

I've sent 3 emails with a signed cancellation letter attached over the past 2 weeks, but have had no feedback and no confirmation.

I initially sent an email to ***, and someone there forwarded it to the 'cancellations department' on ***. I've since sent another email to insuremaintenance. Still noone has contacted me or rep**** to any of the correspondence.

I'm leaving the country next month, so I want my home and car insurance cancelled at the end of July. I've given 30 days notice already in my opinion. Can someone please take ownership of this on Discovery's side?