Worst service ever-still haven’t received refund

Still waiting for my refund, I returned an item I purchased online to the store on the 24/04/26 and requested a refund they said they can return the funds to my bank account and I gave them the bank card to process. So tell me why it’s the 12/05/26 and I still haven’t received the funds in my account. I have been calling the store and also chatting to the agents on WhatsApp but still no refund. How long should a customer wait to get their refund it’s been almost 3 weeks now