Bad customer service at BP Garage at Montague Gardens CPT

A very bad service I received at BP Garage at Montague Gardens Cape Town, I was buying a bus ticket Khayelitsha to Blaauwberg they sell to me Blue Downs to Blaauwberg when I come back to them showing them their error they say there's nothing they can do they can't reverse it to correct their mistake saying I already use one journey, they force me to call Golden arrow toll free number,I try to call that number many times it was unavailable they put the blame on me but the mistake was done by them and the error remained unsolved.