I did the survey last thursday (or was it friday?), but I haven't received my reward yet. In the OP you said it would take a week or so to process this but it seems that people who have done the survey later than I have are saying that they already have received their rewards.
What gives? Should I do the survey again, just in case?
I wouldn't repeat the survey for this, it's best to give it another few days - the team are still processing Thursday and Friday's survey results (we've had a LOTTTTT of submissions!)
I certainly wouldn't fret - if for some reason you don't have the reward on the 8th day after submitting, pop me a DM and I'll reach out to check what's happened!