Vodacom unable to deliver but unwilling to cancel

I submitted the e-mail below on 7 Oct and has had no response since!:<br> <br> From: Willem Kruger <br> Sent: 07 October 2015 <br> To: [Email Removed]<br> <br> Sir/Madam<br> <br> At the end of Sept 2015 we added a 4G 10 gig/month mobile data package to our account. This was only done after I was assured by Nadeem at Vodashop Cresta that the address was in fact serviced by Vodacom's 4G network. On setting up the router at our premises it was immediately clear that there was in fact no 4G coverage. While this was obviously an inconvenience, we were comfortable that the hardware could be returned and the contract cancelled. <br> <br> We returned the hardware to Vodashop Cresta the following morning and were assured that the contract would be cancelled. That has unfortunately been the only positive experience in what has otherwise turned out to be shockingly bad costumer service. I have called and visited Vodacom Cresta numerous times over the past couple of weeks to try and resolve this. Not even once was I actually called back and informed of progress after repeated promises to do so. <br> <br> I cannot understand why cancelling a contract on which Vodacom is unable to hold up its end of the bargain is so difficult?