Bad Service!

I have been a Business Cell C customer for nearly 10 Years. We have had a number of problems over the years and now only have one contract still left with Cell C. It was due for an upgrade since 2017, we tried from the beginning of the year to upgrade. We tried to upgrade in-store, with no luck because we have a business contract, we called and no one could help us over the phone, we were promised a call back, which we never received! this happened time and time again! we eventually gave up! On the 27th September 2019 we saw there was a Friday deal for the new iPhone 11 and thought we would try one last time! We had the same issue, no-one could help us over the phone and we had to wait for a call back, we were all about ready to cancel the contract when we finally got a call back on the Monday (after a very frustrated call to customer services). We went through the upgrade process over the phone and were promised our new iPhone 11 that week. it has been 6 weeks and we are still waiting! we have called and called and no-one can give us any feedback! the only answer we get is "sorry there is no stock"! When we ask what is the solution is, we are told to just cancel our contract! I find it disgusting that Cell C can sell a product knowing that they can't deliver on what they've sold, and even more disappointing, they won’t even say how long we have to wait. We are paying for something we don't have! We will never sign up for another service with Cell C again! not for fibre or any other business or personal products again! it has been 10 years of bad service and this is the last straw!!