Renewal offer was not met, 264mb for 24 pounds but I am paying 55 pounds

Got offered 264mb for 24 pounds so that I wouldn’t leave virgin media, now they refuse to give it to me.

Hello, we had to move houses in may 2024 and I decided it was a good chance to get a new contract with another provider as my contract with virgin media had finished. I decided to open a live chat and talk to them about ending my services. However, I got an offer which I couldn’t resist. I got told I would get 264mb for 24 pounds if I were to stay. I said yes and I got told that I had to contact once I had gotten to the new house.
Once I arrived at the new address, I contacted them 5 times and each time they said they couldn’t match that offer, each time with different reasons such as they just can’t, it hasn’t been a month which means that I can’t get a discount, it hasn’t been 48 hours so I can’t get a discount…
They even put me on a ghost 7 hour long waiting queue.

One day I realised that I suddenly had much higher speeds than my previous M125 contract. So I contacted virgin media as they had given me the 264mb but it was for 54 pounds a month.

Once I got someone to agree that I was given a deal and that 48 hours had passed, I got told that I would get the updated price within the next few days. Yesterday I just got an email saying that I had no contract with virgin media and that my current price was 54 per month.
I have tried contacting but I literally got put in another blank queue which I was not going to keep waiting in like last time.

What can I actually do. I have submitted a complain and I am waiting for their replies. Sadly I couldn’t submit any of the screenshots while filing the complaint.