Unfair Claim Rejection After Insurance Previously Approved a Non-RMI Invoice

I am extremely disappointed with Auto & General. My car previously had engine failure, and while waiting for them to approve repairs, they delayed so much that I had to fix the car myself with a non-RMI mechanic. I sent them the invoice, and they approved and paid for it without issue.

Now, my car has another engine failure, and I submitted all required documents. However, they rejected my claim, saying the previous invoice wasn’t from an RMI-registered mechanic and didn’t show mileage. But if that was a problem from the previous invoice, why did they approve and pay for it in the first place?

They are now using their own past mistake as an excuse to reject my claim, which is completely unfair. This is bad business practice, and I will be taking this further if they don’t resolve it. Sort this out, Auto & General!