Sainsbury's Supermarkets review: Online shopping

I ordered 12 bottles of Tattinger champagne to be delivered to a friend's address ready for Christmas. The champagne was on offer via nectar points and Sainsbury's were also offering 25% off for 6 or more bottles.
The website kept giving the full price at checkout, and I contacted Sainsbury's twice to ask why and both times I was told I would only be charged the discounted amount, and then the second time I was told to cancell and reorder, which I did, but only for the pink champagne as the normal was no longer on offer ! The champagne was firstly delivered late as the security tags had not been removed...after delivery, as all bottles were in boxes, it turns out we only recieved 4 bottles of pnk and 2 bottles of normal, and to top it all, I was charged for the nectar amount discount and not the 25% sainsburys discount leaving me with 2 bottles short of pink champagne and have paid full price so £ 60 out of pocket. I have spoken to 2 of sainsburys representatives who have said it is being dealt with and 3 weeks later...not a word this is appalling service.
I refuse to spend any more money until I have a refund, replacement champagne and the £60 refunded into my account and not in vouchers !
Paul Sizeland
Order number #1358072031