Poor customer service and unacceptable delays in dealing with returns/refunds

I purchased 2X kindle fire 7 8gb kids tables with covers. The products were highly not user friendly. As an adult, I struggled to navigate the features and everything has to be tapped twice before opening, so imagine how a child will use that. So I returned the tablets (1 still sealed - unopened) and 1 opened which was the one we struggled to use. The products were returned with all accessories, charges, covers including the packaging that they came with. 3 days later when tracking the status I receive reject status with accessories missing. Next thing my security brings the items returned from Take-a lot indicating accessories missing. Opening them, they returned 1 tablet and wrote accessories missing. No description, no phone call, nothing. Customer Service unacceptable. This was my 1st purchase with them and surely my last. I called them again today, put on hold for 15 minutes whilst the query was being escalated. After that 15 min i'm told they are waiting for images from the warehouse and they will get back to me. I find their service completely appalling and demand for my refund for both tablets immediately. Every single item including the packaging papers were returned to them so they cannot claim missing accessories unless they intentionally removed those accessories to avoid items being returned.