Ackermans Loch Logan Bad Service after sales service

My friend bought a phone from Ackermans Loch Logan. The charging system were faulty and she returned the phone to them. The phone was handed in on 29/03/2021 and until today there is no response from Ackermans Loch Logan. We keep on phoning and even the store manager is not responding or return the calls with an answer. I demanded that the phone must be replaced with a new phone since it was under guarantee. None of the staff ever come back to us with an answer. This type of service is unacceptable , They do not even deserve one star.