So you have already returned it to Zavvi then mate, did you get proof of postage? Are they replacing it rather than refund you? Actually...with all the problems you are having I guess you don't know either.
I've found a few numbers for you to try to contact them on mate: 0844 264 0702 or 0844 503 7484 and 0871 989 1083 although I have no idea if any of these are still active or will get you through but worth a try eh.
This may be worth a go too...it's the details given on the Zavvi outlet on ebay:
The Hut Group Ltd., Meridian House, Gadbrook Park, Gadbrook Way, Rudheath, Northwich, Cheshire, UK, CW9 7RA Phone:08442439088
From what I've seen so far you are not alone in having issues contacting them and getting issues resolved so there is no way I will buy anything other than discs from them personally, I hope some of that info is helpful and that one of the numbers works
ray:
OR try them on Facebook here: https://www.facebook.com/zavvionline where you can message them, I'm sure if you started to leave negative comments they would get back to you pretty quick