What to do if you believe you have been wrongly given enhanced mobility?

Does anyone feel they have been wrongly given enhanced mobility?

I've been on standard living and standard mobility for several years. Then standard mobility was dropped back in 2019. My mandatory consideration was also denied then but I got my standard mobility back at the tribunal.
Skip forward to late last year (2024) when my mobility was dropped altogether again. This time my mandatory consideration was accepted but they have now upped me to enhanced mobility.
Due to certain light conditions (low vision) and days of fibromyalgia flare-ups, I can stand and then move unaided more than 20 metres but no more than 50 metres. This is 8 points, but the assessor has now given me 12 saying I can't stand and then move more than 1 metre either aided or unaided. I feel like a fraud and it's making me sick about what I should do.

I'm worried my mobility could be stopped all together if I ring and tell them they have made a mistake, or have to go through another assessment (they make me feel so depressed and anxious) but I don't want to be accepting enhanced when I don't fit that criteria. I really don't need this extra money as I rarely want to go out. and I'm fine moving around in my own home and immediate environment. Standard was perfect for me as it was more than enough to get cabs to appointments when I needed them. This back payment has also taken me over my allowed £6,000 savings.

All advice would be grateful.