bad service

We were at mc donalds in mitchells plain drive through nw we ordered sausuage nd egg mc ****ins 1 happy meal 1 cuppacini nd 1 coffee nd 1 kiddies juice.we gave slip by collection window the lady gave order nd read from slip our order.we gr home nw 2 find half of our order wrong they gave 3 chicken nd egg mc ****in we called branch nw nd they said we must return it so we said but its nt our fault R they gna re emburse our petrol for driving up and down nd person on fone disnt knw hw 2 solve problem husband drove back 2 branch now again 3 return wrong goods.