Tendaisy does not work!

I ordered multiple items from Tendaisy, for more than half of the items I received an email saying the item I ordered and already paid for is not in stock and I will be refunded. The refunded money is a lot less than the amount I paid. I already paid a large amount for shipping because of the large amount of clothes I ordered but now most of the clothes I am not receiving and I am still paying shipping for a big order and I am not getting a proper refund for the items not in stock. Nobody gets back to you regarding the orders. Its been a month now and the few items that they need to ship to me has still not been shipped even though it says on the app that orders get shipped out within 2 days. This business is not ethical, they don't let you know on the app when an item is not available, they allow you to order it and pay a big shipment amount and then later notify you it isn't available and you don't get a full refund. I live in South Africa. I have ordered from other similar clothing enterprises that were a lot better organized.