Bad service

I purchased the incorrect ****les just before the lockdown based on wrong advice from their sales staff. I returned the ****les the next day on 26 March 2020. Since then I'm trying to get a refund. I have mailed a person by the name of Joseph a couple of times and have visited the store in Menlyn Shopping Mall. I'm not getting any response from them. The amount is R3777. I threatened them with social media and hellopeter, without any response. They simply don't care.