Cannot get though to the cancelations department

Got called by the call centre and offered an upgrade, but then got stuffed around repeatedly with the delivery of the new handset. I eventually got fedup with this and decided to cancel the upgrade as well as the contract. Contacted the call centre to cancel and was transferred to the cancelations department. After being left on hold for more than an hour the call got dropped. I then sent an online query asking to cancel, as well as sent a fax with a cancelation notice. Got a email back from the online query saying that it's been escalated and that I would be contacted by someone shortly and that the call is now closed. This has now been more than a week ago and I still have not been contacted. I also have not had any feedback regarding my fax. Tried calling the call centre again to find out if my cancelation has been received and actioned. I told the agent what I required all he said is \I'll transfer you to the cancelations department"and he transferred me not even giving me a chance to tell him I would prefer not to as they do not answer their line. And sure enough got put on hold again for eternity without being assisted and never being taken of hold again."""