Poor service

Helo Peter, i opened an account at Game, Highveld mall in October 2018, took some stuff, then by the end of November 2018 i settled it. The cashier charged me more and now they have to refund me. I went to the shop to ask what do i do to get the refund, no one seems to know, they keep on sending me from pillar to post, when i demand to speak to the manager, they give me wrong email address for the refund, the staff is ***********.