Same problem but now solved! The way it went:
1) waited and called - they said the 2 months must pass
2) the 2 months passed, called again - they said the bullsh*t that it's not their responsibility
3) sent a mail to the following addresses describing the story and saying that if I'm not getting a meaningful reply soon I'll go to ASA and similar authorities on fair advertisement:
I received my gift card within an hour 🙂 🙂
Good luck, all!
Got a £50 voucher from Tesco that worked for about a week and then stopped working in store. Tesco said to call a number which I rang, but they said to go back in store. Tesco are claiming it's an issue with Now TV and vice versa. Now TV refusing to do anything about it. I'm now getting Trading standards involved