No response for deceased estate

My father Richard Burdock (***) passed away on the 26th of December 2014 and since this time I have been doing everything possible to try and cancel his Vodacom contract without any success. I went to two different Vodacom branches in Johannesburg and was told two different stories about how this should be handled. I was eventually told that I needed to email [Email Removed] with all the relevant documentation and it would be taken care of. Well the first mail I sent didn't get a response to, the follow up mail asked for the documentation (that I had attached to the first mail), I resent this, then the 4th and 5th mails didn't get a response at all. This is completely unacceptable, please can this be resolved ASAP.