I generally find these emails quite amusing though I wonder if there's a pattern emerging?
I never have a Goodybag but if I make a little use of giffgaff (calls, texts or data) in a month I get the PAYG recommendation. On the other hand, if I make no use of giffgaff, I get the Goodybag recommendation.
Did someone say that the algorithm needs a tweak?
Just looked back at my previous 'Best Plans' (not easy as they were hidden amongst the hundreds of others from giffgaff)
and Yes I also found a couple of recommened 'PAYG' plans.
It's just the one for this month (July 2016 - £5 Goodybag Recommendation) that's wrong for me.