Bad Service

I am most unhappy with Cell C whom I have been a loyal customer for over 20 years . I renewed my 24mth contract and received my upgrade phone (Samsung A32) earlier this year. Since I have got this phone I have never been happy with it, it is far inferior to my previous phone. The battery life was non existent and there is Chinese writing that appears on the lock screen and various other strange things going on with it. It was sent in for repair where I did not have my phone for 3 weeks and I am still not happy with it. I have phoned the call centre numerous times and eventually resorted to Facebook where they tell me to hand my phone in at the nearest Cell C store for assessment. This is a brand new phone and I am not keen to send it back again to be phoneless for another 3 weeks. The right thing to do is either replace the phone or allow me tol return the phone and cancel the contract without penalties. Please help!!! This is not fair and seems to fall on deaf ears.