Bad upgrade experience x 2

This is a follow up to my last complaint, seeing that this is the only way I get a response from Cell C. I want to cancel my contract. I want to cancel the upgrade I did on 26 June 2018. Cell C does not have stock of the phone I want, they sent me a wrong phone, I returned it. The first reason I could not complete the cancellation was because this said phone was in for assessment, it was RECEIVED by Cell C on Monday as confirmed by follow up department and the assessment takes 2 days. Was told to phone back today to complete the cancellation, as the assessment needs to be completed before I can go forth with the cancellation. I phoned today, today I was told the truck that had my phone in its possession was hijacked, I cannot complete the cancellation because Cell C needs a lost letter from RAM to state they will replace the ****** device. Please tell me why this is MY problem? Surely you have insurance between the two of you to cover these kind of incidents. I do not want someone to phone me and sweet talk me again. I want this upgrade order cancelled with IMMEDIATE effect. I do not want a contract with Cell C anymore. I was told that I will be phoned during the course of the day to inform me what the way forward will be. Please understand something clearly, this is NOT my problem that the truck was hijacked. Risk and ownership was transferred from myself to YOUR preferred courier company when I signed the RW slip provided by the courier. Urgent feedback in this regard will be appreciated.