Iphone 6S+ 128GB cellphone availability

I ordered an Iphone 6S+ 128GB cellphone from Cell C on 4 January. I was told it was out of stock and would be available the next week. I signed the contract over the phone. I was never informed the contract was not enforced, and discovered this when Cell C salespeople called me to sell me contracts. I have contacted Cell C on at least half a dozen times and Cell C has contacted me to sell me a phone a half dozen phones without acknowledgement that I am still awaiting my phone. I have been in to the Sandton store on numerous occasions and each time am told the phone is on order. It is three months since I tried to upgrade my contract and I am still without a phone. It is outrageous that Cell C advertise the phone in all their adverts and yet are unable to deliver on their promise. My partner and I are both Cell C customers and we are both reconsidering our position. Get your act together Cell C, especially when someone is trying to give you business.