Incorrect Cellphone

I was contacted on Friday telephonically to an upgrade. I told the lady more than once I wanted an iphone 6 64gig. I told her I do not want an Iphone 6 plus. I confirmed with her more than once. Delivered yesterday was an iphone 6 plus - not what I asked for. I then checked the contract, Iphone 6 plus. Not what I asked for. I then phoned in, they can only collect in several days time. I want this phone collected today, I want the contract cancelled as I did not request an iphone 6 PLUS. I want my number transferred to prepaid and I will go to Vodacom for a contract. Initially when I was due for an upgrade you didn't have iphone6 64 gig in stock, I checked more than once and at branches. Cellc Direct on Friday said they had in stock when they phoned me for an upgrade. I never messed up, you did. Therefore I must not be penalised for your staff errors. Fetch phone, change my number to prepaid and cancel my contract. I am going to a service provider that LISTENS