Angry customer

Greetings

I bought a phone at Mr price during 9 Sept, during the use of the phone we discovered problems, the battery span of the phone doesn't last a day and the Sim slot 2 doesn't allow mobile data usages. So I took it back to the store around 1 nov than they took it to vodacom to be repaired. It only come back yesterday they gave us a new phone but still experiencing the same problem for the first one I purchased. It's a Hisense U81

Thank you Hope to hear from yall. A refund will be due