Burger King complaint: Ordered plant based burger, received meat one

I went to burger King on Newport road, Cardiff on the way home after a lovely day at the beach. I’ve had quite a few plant based burgers from you and love them, they’re fantastic. I can’t eat meat due to certain religious reasons. When I first opened the wrapper, I did notice it looked different to what I’ve had before, but still bit into it, and noticed the texture and flavour was different, on closer inspection, I noticed gristle and singue, which would only come from an animal. I have never in my life seen it in any plant based product. I was and still am so incredibly disappointed in you, I feel sick thinking about. If I hadn’t made plans, I would have driven back to the restaurant to complain, but I gave the meat to my dog. In the same order, I also bought 9 onion rings. They did only give me 6, but it’s no big deal, I still wasn’t happy about it though. I feel absolutely disgusted. Later on when I got in, I noticed the wrapper that was in the bin said Flame grilled whopper with cheese. You just wouldn’t expect this when you order a plant based burger it doesn’t even sound the same, so why do I need to check?

Ps. Why is burger King still operating in Russia given the current state of affairs?