poor pip assessment

So I sent my basic MR letter, stating that the PA4 was not an accurate reflection of what happened at the assessment and that I had a professional transcript of the f2f which I would be sending and pointing out how this shows these errors and also that I will be sending further medical evidence too. They received it by special delivery at 5.40am and at 11am sent me a text saying:
"we've received the written report of your PIP assessment. We will write to you once we've made a decision on your PIP. As a guide you should hear from us within 6 weeks ..." .ect.

Any ideas why they might have sent this instead of the other message saying they have received my MR request? I am hoping it means they will look into the errors in the assessment report - have you heard of this happening before, Gordon?

Best wishes to all.