Cashbuid the oaks crossing is refusing to give me my refund, i have waited for almost a month for my refund but still nothing

I have purchased 6 diamond mesh from cashbuid the oaks crossing branch which they didn't have stock but they were supposed to get stock from the Mahlakung branch, they only managed to get 5 rolls, i waited for another 2 weeks for them to get stock of the remaining roll but they were not able to do that. I requested for a refund and i was asked to send a bank statement so that i can get a refund, I've sent the statement on the 10th of jan upto today i haven't received any refund, i tried to call the store several times and requesting to speak to the manager with no luck (he's always unavailable). I had to purchase another roll from another store so i can complete my project. I just want to say this is very disheartening, tiring and disappointing, i don't think there's anyone who should be treated the way cashbuid the oaks crossing is treating me I hope you can help me get my money back , i just want my money back and i don't think that is too much to ask because i paid for something i didn't get