Pay just not do not pay refunds

I was charged twice for the same deal, after 4 days of fighting with the store that bought from. I received an email that say they will give me a refund which will take 2 to 3 days. I gave them my account details of which they said they can't verify and they asked for the proof of my bank account letter, which I supp**** then after that I did not hear from them. Their customer service is non existing, no one answers calls, emails are not answered and their chart service on the app is useless. I am still waiting for a refund to this day