I stopped using Top Cashback and switched to Mr Rebates in late 2016 after experiencing a few problems with TCB. Firstly the frequency with which rebates didn't post automatically increased, then claims started being denied.

My experience with Mr Rebates has generally been much better. Rebates haven't always posted automatically, especially when bookings were made many months in advance, but retrospective claims were always successful. Now I've just had a claim refused, with the explanation that the click from Mr Rebates was not the final link before purchase.

I've been playing this game long enough to find that extremely unlikely. I have a separate browser profile solely for purchases through portals and always start a new session, free of cookies etc., and stick to the task at hand without 'side trips' to other sites. So either Accor is being naughty or their systems are not up to the job of tracking. We've seen enough of Accor's IT systems to know that the latter is perfectly possible, but either way I thought it worth posting this warning.