No response from IBurst

<p>I've sent numerous mails to Iburst in order to cancel our contract. These emails have been sent from 31 Oct to 14 November 2016 and I haven't received any feedback on email or on my cell phone from them. I even tired to call a few times (7 times) , whereby I was either cut off or they did not answer the call after holding on for 3 minutes.</p> <p>This should be such a simple thing to do, but seems that they are just not interested in helping me at all, not even trying to retain business.</p>