Poor customer service

I went to cell c Promenade for an earl upgrade. I was advised to pay commitment fee plus November installment. Which I did. The consultant told me my debit order for the 28th won't deduct. Well it did. I paid cell c twice for the month of November [R304]. They did not even advise me on how to reverse the double payment. I told the consultant that I wanted huawei p 2021 smart. He agreed he will keep the the device. When I went at 4pm to get the phone. He said one of his colleague sold the phone. I was so disappointed and angry. This phone I was buying it for my wife. Now I ended up buying Huawei P 40. Which is expensive. With less benefits. P smart 2021 comes with power bank and pouch. I ended up with a P40 which does not come with a power bank and free pouch but I must pay R369. I regret visiting cell c promenade. I love cell c but nothing more I regret than this early upgrade which I ended paying more money and bad service.