Bad service and insensitivity to customers needs

I purchased an iPad cover, only to discover it was not for my specific kind of iPad. I took it bad same day and they took it and promised to order the correct one for me. Two weeks passed and I still had not received no call from them.i kept going to the store to check if they've received my order. On the third week of not having received my cover, I asked that they reverse the sale and give me back my money. They told me they need to contact their head to get the process going and that it would take 48 hours. This was on the 15th April 2015 and I still have not received my refund. I don't know what could be taking so long to reverse a sale. I really think it's disrespectful and insensitive of them to not meet my demands as a customer.