No response for deceased estate to cancel contracts

I am trying to cancel my Deceased wife's contracts, and have been informed by the call center to send a mail with the required documents. I have been given 2 different contact details, and have sent the required information. However nobody ever responds. My wife had a cell phone contract and a 3G contract. The 3G contract expired this month, however it is now being moved to a month to month automatically at 5 times the current price.

I am just trying to cancel these contracts, and will pay the outstanding fee's for cancellation. Please can someone contact me so that this can be sorted out.