Rude cashiers and incorrect order

I placed an order online via the Steers app for collection in Steers Rivergate. Collected the order, but it had incorrect items. The order is written 2 times original on the outside but there are burgers with bacon and no Panda Rave. Contacted the store, Asiphe answered, not willing to assist and said I must wait for the cashiers as they had a change in shifts and she doesn't know what to do. Someone else called me, didn't give me her name, but she asked that I come back to the store with the wrong order, mind you I'm already at home. She keeps on telling me about a change in shift hence the mistake which is not my problem.

She says she cannot resolve the issue without me coming back to the store. First of all I'm a customer who paid for a meal. It's not my mistake so why should I come back?

Both the people I spoke to, have a tone that is not the correct way to speak to any customer. They need to do training on customer service as they do not know what they are doing.