£60 Giftcard Promo?

When signing up i used the promo smarty had on money saving expert for a £60 amazon giftcard after 6months (this was 2025) still not had it so yes before anyone says, yes i have done a live chat using the phone app, was told someone would contact me in so many working days and no one ever did, I showed evidence of the promo and its even on my contract and app plan, (I have screenshots and downloads of everything)

Offer: Money Saving Expert (“SMARTY Affiliate”) promotion – Unlimited Voice & Data
Plan for £15 each month Offer (instead of £20), plus an amazing £60 Amazon.co.uk
Gift Card (the “Gift Card”) (January 2025) Which comes from Giftcloud Limited.

Before i make a formal complaint and leave is there anyone else i can chat to about this. Because so far it feels like i am just being fobbed off.