new phone stopped working after 2 months

Got a new contract,Sony Ericson L1 . 1 Sept 2017.after two months it stopped reading stuff on memory card . bought new memory card .still the same problem. So not the card. Took it back to vodacom wonderpark. They tried and still same problem. Send it in for repairs. Came back yesterday. "We could not repair and replaced it with a new phone" ( phone only wrappep in bubble wrap" (new phone ?) Got home yesterday afternoon....SAME PROBLEM (new phone). Plus the battery has a swollen buldge. Somewhere in vodacom is a ***** person , because it is not the company who send it back.a Person took that decision himself to send back a obvious NOT NEW PHONE , and said it is a new phone. That constitute *****. Is this standard procedure at vodacom ? ***** ? And then obviously bad service.