DO NOT BUT ONLINE - REFUND NIGHTMARE

I did an online purchase. It didnt do what it was supposed to do, so I took the items to my nearest store on Sunday 24 April for a refund. They could not find the item and after 30mins of waiting was told they cant do any as it has to be referred to headoffice for the ta invoice. They took my details down and on Tuesday afternoon was called to say they have the have the paperwork but headoffice will have to do the refund and it would take 7BUSINSS DAYS TO DO THE REFUND!!! When was headoffice going to process the refund, NO ONE KNOWS. SO I AM SUPPOSED TO WATCH MY BANK ACCOUNT EVERYDAY FROM THE 7TH DAY TO CHECK FOR THE REFUND???! Also, W T F does it take 7 working days??? Why can the refund not be processed today so I receive the refund in the net 2-3 bus days??? I will never purchase online again and will be telling everyone about this also !