Online order gone wrong & appalling service from Mr Price

I'm extremely annoyed and unhappy with Mr Price. I placed an online order for a skirt(Medium size). Upon collecting the items from the store, I realized they gave me the incorrect size (Small), unfortunately I was already home and couldn't go back. I called the call centre 3 times and was on hold for more than 15 minutes on each of the calls (I even went on their website and sent my query). On my fourth attempt calling them, i managed to finally get through to someone....Well, not that she was helpfull!!!! I explained my predicament to this lady and she requested that I email her the bar code of the item so that she can indeed ensure that the mistake was on their side (like, have you ever!). She said she'll email me some link in order for me to upload the bar code and email it back to her (I don't know what for because I told this lady that the label is clearly written SMALL, yet my receipt has the skirt in a size MEDIUM). This was Tuesday the 29 March 2022, to date I have not received any link. The reason why I bought the skirt online is because the store in my area did not have my size. I was even willing to place a second order just so that i can get the skirt in my correct size, but unfortunately they have since ran out of the skirt in my size. What do i do now??????I dont have the time to be running around going to different stores to check for a suitable size; im very upset because I ordered the correct size and someone's lack of attention to detail has caused my order to be messed up!!!! I'm really not happy with the service I received, I'm even more upset because I'm not receiving any feedback or response to the query I sent to Mr Price via their website!!!!Never again!