In response to the message below why wasn't my £16 voucher redeemed in that case? So the advisor was misinformed!

I was tempted to choose this website's fast track service as it offered Blue Light discounts. I should have done my research in advance as I discovered that actually going through Stanstead Airport directly this service was cheaper with extras. So I cancelled the outbound booking and was offered a voucher. I decided to use the voucher on my return journey to contribute to the £30 fast track cost. Again I went through the Blue Light app and was shocked when I looked at my bank account that the full price was taken out. I tried to dispute this, spending the last day of my holiday trying to resolve. No resolution was offered, as I was informed that the voucher could not be used in conjunction with the Blue Light discount, must be in the small print, to add insult to injury the Blue Light discount wasn't applied either. I wasn't even offered a goodwill gesture or a refund to rebook with the voucher. An expensive mistake on my behalf, a miniscule amount of money for good customer service. I will use Stanstead Airport fast track from now on, so much cheaper than this organisation that purports to support key workers!