Very poor aftersales care!

I purchased a pair of shoes from website onedayonly.co.za on 15 June 2020. Unfortunately they were the wrong size and I have been trying to return them since I received them but with no luck. I have sent numerous emails, the first one was sent on the 25th of june but as I write this I am stuck with a pair of shoes that does not fit. All I get are automated responses to my emails. I am very disappointed with the poor aftersales care. Surely returning a product should not be this difficult.