@ vivi62, from my personal experience - it doesn't matter what/who led you to this Now TV offer.
I've been all around the houses using any means - phone, text, emails, Twitter, letters - over a period of months so that's why can say this with confidence. You just need to email the admin agency referenced in messages above (this thread) including one from me.
Seems we’re in the same boat I’ve been trying to get my £50 voucher since last October , it’s not a third party offer it’s a promotion by Now Tv . Looking at comments here and elsewhere it’s been all but impossible to get this offer completed . Now tv customers service has appear ed to be sorting it but it’s still not sorted , I’ve been revered back to compare the market but they revered me back to now tv .