Really bad service and taking advantage of loyal customers

Placed an order on Spree on the 20th of July and another on on the 21st of July, the second order arrived earlier than the first order but on the same day, on the 27th of July. So now with my first order some items they omitted and they gave me a store voucher without my knowledge or any reasons why the item could not be delivered. so it happened that i got really upset and returned all items in so doing i had to wait for another week to go by so that i can get my refund and when it 'supposedly' funded it was short with the price of 1 item. i called spree twice and they told me the missing item did not reach their warehouse. spree owes me R1505 in total and i'm still waiting for the supposed 'refund' that was made on Saturday of R568, with outstanding refund of R937. i've spoken to Natasha and she could not give me her name saying its confidential information, like really????