Bad product

I refer to your response to my complaint regarding my 8 Vuse Go devices that are not working.

I confirm that I was contacted, but I was unable to take the call at that time and it was agreed that a follow-up call would be made. I subsequently called in myself and explained the situation in full, including forwarding the codes for 4 of the devices.

I am now being asked to provide slips/receipts, which I do not keep for products of this nature. I would like to point out that:

The device codes I provided should be traceable and verifiable on your system, as each code is unique to the device. I have already provided the names of the two stores where the devices were purchased, which should allow you to confirm the purchases without a slip.

I would appreciate it if you could investigate using the information already provided (codes and store names) rather than requiring proof of purchase that is not standard practice for consumers to retain long-term. Please advise how you intend to proceed, as I would like this matter resolved.