Non-conformance on value for money

Phone sent for repairs the 4th time in 5 months, still under warranty, barely 1 year old. Samsung S21 battery not even lasting for half a day, battery replaced 3x times and same issue occurs. Phone sent in 4th time for repairs. This is not value for money, paying almost R700 p/m without being able to use the phone. Next step is to complain at the NCC. Done with paying for something I don't have.