Here is their reply:
I represent Executive Customer Relations within Amazon.co.uk. One of our mandates is to address the most acute account and order problems, and in this capacity your account and orders have been brought to my attention.
I am sorry to hear that your Marketplace order was not a success. I understand that you returned the 8GB Cambridge Sciences G7-II 7inch Android 2.3 Tablet to Quality Stores, but that you have not yet received a repair or replacement.
Though we are unable to share account details for Quality Stores, you correctly noted that this seller's feedback profile indicates they have no open sales listings. For account privacy reasons, I cannot divulge any additional information pertaining to the seller's account status.
I regret that we cannot be of more assistance on this occasion. Unfortunately, outside the A to Z Safe Buying Guarantee, Amazon cannot directly mediate or intervene in Marketplace transactions. Rest assured, however, that we expect Marketplace sellers to provide excellent customer service and, where sellers consistently fail to do so, swift and appropriate action is taken. We want all of your Amazon shopping experiences to be second-to-none, and the Marketplace platform is continuously monitored to keep order issues to a minimum. For more information on Amazon's role, follow the link below to review the Participation Agreement.
(It wont let me post the link)
We are sorry that you feel the need to bring this issue to the small claims court. As previously advised, we are unable to provide any additional contact information for Quality Stores. Even though your purchase was made from a Seller, we can see that it may influence your decision to visit our website again, but I hope you will allow us another opportunity to prove our level of service to you.
To restrict your searches to products sold and dispatched by Amazon.co.uk, you must first search for the desired item and select a department. Once a department is selected, a seller filter will appear in the left hand column. You may select Amazon.co.uk, or any Marketplace seller, to view filtered listings.
I hope the issue is resolved soon.
Regards,
Executive Customer Relations
Amazon.co.uk