Samsung A12 a serious disappointment

I bought a brand new Samsung A12 in the Sandton City Samsung store on the 10th of March 2021. It was my birthday. I was so excited as I truly believed that Samsung was a reputable brand that I could trust. One month after purchasing this phone till today, this phone is repeatedly freezing and the touch screen fails. when I'm on a call and I place the phone on my ear, it turns off the screen (this is normal) but the problem is that when I look at the phone, its a struggle to turn the screen back on Southam I can end the call. This is usually automatically activated in any smart phone. It constantly wastes my airtime due to struggling to so something that Samsung competitors have happening automatically. It also constantly shuts off access to both networks as its a dual sim phone and writes "sim reset".. in that time it looses all connectivity. I first thought that this was due to poor network but I soon realized that its the phones lack of capacity. I am really disappointed with this Samsung product and I feel I wasted my money. I have been back to the Sandton city store to complain and the same person who was telling me what a great phone it is when he was convincing me to buy it now tells me that its an entry level phone so if I wanted a better one I should have purchased a galaxy model... Outright outrageous it is. R6500 entry level phone .. please advice me on this...

I thank you