I've just been into my local ASDA and yet again my Rewards Vouchers show up as invalid on my receipt. The first time I tried to use them a few weeks ago this happened and I was told by the cashier to phone customer services. I tried twice but after holding on for over 45 mins each time I gave up. I then had the bright idea of buying just a couple of items at the customer service desk, stupidly thinking they would be able to get them to work. They couldn't and after a large queue developing behind me, they advised me to email customer services rather than phone. I had to email twice over 2 weeks before I got a reply, so much for their promise to respond within 48 hours! They subsequently deleted my vouchers and returned the money to my "pot" so that I wouldn't run out of time to use the vouchers. They said their technical team was looking at the problem with vouchers and to leave it a few days before creating new ones. I've just been into asda again and, unsurprisingly, my new vouchers don't work either. I was told by the cashier that I'm not the first this had happened to, so wondered if anyone else has come across this and how did you resolve the issue?