Bad customer service from till operator

Went to shell Denver M2 east to fuel my tank and buy a drink, the queue was quite long and slow....just as I was about to reach the till point, the till operator by the name of Alice called out for the next customer....of which the were 3 people before me, the didn't hear here calling them.....

Alice then called for a guy who behind me, at that moment I was trying to inform the people before me to go pay, already Alice was helping someone else worst someone even behind me.

I raised a complain with her and asked why is she making the guy jump the line, with attitude she respond in Zulu "mos aningizwa" meaning I've been calling out next please and you not listening....

I responded and said I heard you hence I called the people before me to pay, it's a noble thing to do not to jump a queue....

She just ignored me and still helped the other guy.....poor customer service and I would like to see it taken up to management to train their staff about customer service....

I was also in a hurry just like everyone else......The list she could do was apologies and serve me before that gentlemen because I had already complain about it.