Damaged back cover with scratches

Yesterday I purchased a Samsung A10 at Edgar's Jabulani Mall and the phone was attached to a Vodacom SIM card within its wrapper and the lady at the store than gave me a different SIM card , the SIM card was inserted and I was handed the phone and I thought okay it's all good no setup was done like how a new phone is setup , than few hours I got home I looked at the phone if I'd received the benefits that actually come with a new phone the free data and airtime but the balance was R0 so I than identified fibre scratches and returned the same day to the store and they were closed , returned today to complain and they than tell me I could've done those scratch's , the lady than shows me how a brand new phone comes and it didn't have a simcard attached to it , from that I knew this might be a second hand phone that might've been repaired and I'm sold a phone with a scratch and things don't add up. The manager asked me to come along to Vodacom yet I didn't buy it at Vodacom like what can they tell me ?? There are cameras and I told them to look at them yet they didn't , my customer rights have been violated in selling me a damaged phone within less than 24hrs it's unexpectable that I might potentially have a repaired phone.