not enough effort

i bought a pair of shoes from Foshinini at Cresta Shopping Centre on the 27/10/2017, 5 days later i notice that the both shoes are for the right feet. i then went back to the store to inform them to assist with getting the left shoe for me as i didn't want a refund or exchange for anything else. i left my contact details in store but the only feedback i get is when i go in to the store to check if they have anything for me. i do not think the store is making enough effort with finding the left shoe for me and i think i have been very patient.

I believe it is the stores responsibility to make sure that shoe boxes are checked before they are on display/ sold. this pair would have never been purchased if it was checked before being displayed. I was also disappointed to know that because i paid cash, the store cant run the shoe code to check who had bought the shoes, hopefully contact them to check if if their shoes were perfect. this could only be done if one had bought on account. how long does it take for a store to assist with a query?