Sorry this will probably be long! First time posting but long time lurker.
I received an email from sainsburys on 22/03/15 telling me that If I ordered 2 separate lots of shopping (of £50 each) by the 19/04/15 that I would then get an email voucher for £25 off a third shop provided that was for a minimum of £50 too. It also said I would receive the voucher (provided I had fulfilled requirements obviously) on Thursday 23rd April. I thought this was an unusual offer and the T&C were long and complicated so I read through them several times to make sure I had understood and even wrote on the calendar yesterday to remind me to check my email as I had ordered my third shop for this evening and I assumed I would have been able to just add the e voucher and re-check out the shopping, however the email never arrived so at 8.15 this morning I phoned the care line (which costs me money as it's 0800 and we don't have a landline yet) but they kept brushing me off. The first person couldn't help me passed me to another guy who kept putting me on hold and parroting what his manager said - first he told me I hadn't spent enough and I told him I absolutely had and I always screen shot stuff like that then he insinuated I hadn't read the T&C properly and that the bit about the e voucher actually said you will receive the voucher from Thursday 23rd which I pointed out wouldn't have really made sense seeing that the third shop need to have been done by 3rd May and what if people didn't receive it in time,
He just kept apologising/mumbling I asked to speak to his manager so that I could explain thinking she would have the authority to sort it but she repeatedly insinuated I had misread the T&Cs!
I felt like I was banging my head against a brick wall I told her I'm here with three kids in a semi-rural area and even the milk has run out but she was on robot mode! She said she would 'sort' it meaning she would make sure I received the voucher but when I asked if I would be able to add it to today's shop (can't usually amend things on the day) she said that no I wouldn't be able to 
I told her I was furious and have been regularly shopping with them for 17 years but I'm seriously considering stopping due to being defrauded and mislead and she just said yeah yeah I totally under stand (patronising) I suggested that they just knock £25 off my bill but apparently she couldn't do that, when I pressed her, she said she could arrange for the £25 to be refunded to my bank after this evenings shopping has been delivered but I will have to phone them to request it! When I pointed out I would be making another expensive call due their error she said that unfortunately we have no way of calling you back to sort the refund aaargh I give up!
So, just wondered if any of you guys had received this email and had problems with it and what I could do about mine. On principal I feel I should complain. She said I could write to head office but just feel I will get brushed off again and I've wasted nearly 2 hours out if my life already.
If you got to the end thanks for reading - feel better now I've typed that 