I had a problem with a £9 money off voucher sent to me at my address, but which turned out to be for some other poor soul's card - I am baffled by how this arose and I did not notice (I don't usually cross check the number with my nectar card). I went to Sainsbury's to use this voucher but it would not accept at the till so I was told to call Nectar. They told me it was a Sainsbury's voucher so not their problem and only Sainsbury's could deal with it. Sainsbury's said it was a Nectar issue and only Nectar could deal with it. Over 1 hour 30 min I was passed to and fro at least 5 times and was finally offered a 'Goodwill' Voucher for £5. The voucher I tried to use was indeed not mine, but the problem arose from a crossed wire in their systems. Not at any point did anyone apologise, or offer a way to find or sort out the problem, simply said not your voucher, the other party is responsible. I think this is appalling customer service and has completely put me off shopping at Sainsbury's.