Samsung A6 plus is a ****ty phone!!!

Yet again another issue with Vodacom. Earlier this year I got a new phone from our beloved SAs leading cellular network. It is a Samsung A6 plus. A day after I received it guess what? Phone doesn't charge. I take it in and that should be an OBF right? Wrong? It went in for 7 days and they came and said they changed the mother board. Fast forward to 2 weeks ago one part of the screen doesn't respond and it blacked out completely and did not respond to me pressing buttons. I took it in again mother board was changed and guess what! The phone still blacks out and the same part of the screen still doesn't work. I had to pay excess of R900 for a phone that has been problematic from the beginning and still is. I need a competent person to sort this out. THIS PHONE IS NOT OK!! Its ****ty!!!