Terrible service...or rather NO SERVICE!!!

I have been trying to upgrade to an iPhone 6 64G for more than a week. I have literally been to about 20 mtn and apple stores - no one has stock and no one can tell me when they are expecting stock.<br> I have tried phoning the call centre, but there is no answer. When I complain in store - the strike gets blamed. How can such a small group of people hold the company to randsom? Surely there must be contingency plans in place?<br> When I finally found a store with stock, I could not upgrade as it says my account is outstanding, even though I have payed my account in full and I received a confirmation of payment sms.<br> The strike cannot be to blame for everything, and surely if I am not getting service from you I should be able to cancel my contract?