Poor service and refund amount short

I purchased a item from Ubuy and was excited to get a local SA online company that had the items i urgently was looking for. I placed my order on Monday 20th April and paid with paypal. The order was placed and 4 days later i enquire about the order. The agent tells me they will start processing it today, since the tracking progress was stuck at processing. 20 min later i get email saying the items are not in stock and the order was cancelled by them and my full amount will be refunded. Two days later i get email from Paypal that my transaction was refunded but only to see that its R474.66 less. I contact Ubuy and the answer i got was those are my bank charges and i should contact the bank for this. So effectively i have lost that amount and got nothing for my money. Is this logical? Is this the way you do business? How is this full refund? Shocking that such a place is allowed to trade.