[Closed] I want to complain about Zavvi - Who do I complain to?

Background:

I ordered Xbox game before Xmas. It was the wrong game, so my fault.

I realised upon receipt, and posted back via myHermes.

I chased Zavvi up for the refund and they responded saying they had no record of receiving the games back in to stock and asked for POD. I sends them said POD which shows the time, date and signature of Zavvi member of staff.

The parcel was signed for on the 03/01/13. The POD was emailed to Zavvi
29/01/13. As I didn't hear anything back from Zavvi, I emailed them again on 05/02/13 advising them that if I hadn't received the refund in my account by 12/02/13 (Today) then the matter would be escalated to the ombudsman.

Would you agree I have clear grounds for contacting the ombudsman at this stage? Or am I being a bit keen?