Edgar connect bad service

I bought a cellphone at your thavhani mall edgars connect. It was not working for a while. Took it back was told its my sim card that's faulty. Did a sim swap still the phone was not working . Took it back again after so many people tried their son cards and it was not working. The staff were *********** in resolving the issue. They were like headless chickens asking me the customer what would I suggest. Train your staff to handle complaints