Lies about cash back, no follow-up from managers

I signed up for a Makro RCS credit card in mid-December last year because the in-store salespeople as well as the website promised 1-3% cashback quarterly (1% for in-store, 3% online). I did the maths and it made sense with that cash back. I have 3 emails from Makro detailing the 1-3% cashback and screenshots taken today showing the Makro website still says that’s an active perk of the card. Since December, I have not received cashback once. I have escalated the issue 4 times both in-store and calling RCS, and I get a different story every time. The first 3 times I was promised a manager would call me, but no one ever followed up. Today on my 4th attempt to get my cash back, I was told that Makro no longer has this promotion, despite it still being promoted on the Makro and RCS websites advertising this card.

Where is my cashback? If you canceled this promotion and never informed your customers, then please help get me refunded for all of my monthly charges (card fee and mandatory insurance) and cancel my card, as it was offered to me until false pretenses.