Bad service

Bad service. My sister bought a cash phone (Samsung A12) 24 December. The phone was faulty and she took it back on 30 December, still being under warranty. They took in and send it to repairs division. She waited till the 25 of Jan 2022 and was told by the repair division to get a replacement phone at the store she purchased the phone. Till today she is still waiting for the replacement phone as they do not have stock in the warehouse of this phone yet they are running promotions on this phone. There service sucks