I have been a Vodacom customer for approximately 20 years

I have been a Vodacom customer for approximately 20 years. I upgraded to a Vivo Y11D on a 36-month contract after specifically explaining that I needed the phone for graphic design. I was assured it was suitable. Within 48 hours, I raised concerns about the overall display and image quality. This is not only a camera complaint. The phone has now been assessed twice, yet I feel my actual complaint has not been properly investigated. I was also given conflicting information about the 7-day return period. The store later refused to assist, stating that Vodacom has policies preventing an exchange. The Store Manager, Temba, told me that only Head Office can make the decision and that, if it were his decision, he would assist me. I am not trying to avoid my contract. I am even willing to pay more per month for a better-suited phone. After more than a month, I am still without a satisfactory resolution. I am asking Vodacom Head Office to please take ownership of this matter and provide a fair solution.