Unfair sale

On Friday the 13th I went to Edgar's Gateway Mall hoping to buy a Samsung A15 while browsing a vodaccom consultant approached me with an offer while asking for further clarification they said they were going to check on the system and they signed me up on an unfair contract that is Sim locked I cannot even log in with my email or do any thing with that phone it is practically a toy. The phone initially cost R4000 but with this contract it adds up to R7000 which is unfair and it was not agreed upon I was forced to take a phone that I am not pleased with because they only cared with their sales not the customer satisfaction. I practically begged them to cancel the deal i will pay cash for the phone they bluntly refused.The people that assisted me was the manager Chamaine and the sales consultant Devashni at Gateway Mall at Edgar's. I spoke to Vodacom consultant and they assured that they cannot cancel the contract as it's Edgar's store fault and they are the ones that should've canceled it on the sport as I was an unsatisfied customer.