Unacceptable

I signed up a new contract 15 May 2015, my contract was approved, received a notification via SMS, Then 27 May 2015 received another notification informing me that they were out of stock, I have only received the data sim and no device, as part of the deal. I'am extremely dissatisfied with the way new customers are treated. I have on numerous occasions contacted their follow up department and get the same negative response, i wish to cancel my application with immediate effect. This is highly irresponsible to sell something if there is no stock. I need this to be resolved, thank you.