Misleading and BAD service

I purchased clothes online and delivery was quick. When I logged a return for the items not needed, it took more than 2 weeks to be picked up. When I AVENTUALY received my refund, it wasn't the full amount. They deduct a small amount and blame it on a system error. Funny enough this happened to my friend and my mother also, so how is this a system error? I don't know how many people they catch with this. I am STILL waiting for the refund of the difference, because even if it is a small amount - it is MY money. They show that you get a full refund for items returned?? No response on e-mails!!! I will NEVER shop from Spree again. And I will certainly tell as many people as possible about this.