Insurance Cancellation

I cancelled my cellphone insurance on the 9th of April. I knew it was just out of the 20 busniess day noticed so I accepted the fact I had to pay another month. This month on my bill they are still charging me when I infact got an email back to say they are processing my request. Also they said someone will contact me and I have to yet to hear from them. I may have missed the call but if so they havent called me back