Unhappy Online shopper - Totalsports/ TFG

I made a purchase on the 9th of November on the Total Sports online store and my order was cancelled and filled in a form for my refund. Almost a week later i received an email saying that something happened on their system such that they could not see my bank ccount number to process the refund so they requested my bank statements with all account details visible, which i did send them. Now i haven't received any acknowledgement via email or a specified timeline for my refund to be processed.

After waiting a week, they readvertised the same product as being available online and i even called to double check and confirm before making ANOTHER purchase. I was informed that the product was available so i clould go ahead and make the purchase. Today i received another message saying that my order has been cancelled due to insufficient stock meaning that i have to process another refund. As a customer, this is just irritating and also is an expense on my part as my bank charges me for online transactions. Please TFG, update your websites on a regular basis because as customer, such is frustrating