Agree.I totally agree with K Spot regarding your need to contact the breeder you 'paid extra for pullets' and request they swap out for an 'actual pullet'.
I breed, raise and sell started pullets and it is for this reason that I do not sell any birds until at least 8 weeks of age as by that time I can - with
pretty good accuracy - determine sex.
Several months ago I sold a gorgeous EE and Welsummer cross and thought it was probably a pullet but told the buyer if I turned out to be wrong
I would gladly exchange it for another bird but she like the coloration of the bird in question.
I recently heard back from her that he had begun to try crowing so we arranged for her to come back with the boy and she picked out a pullet.
Reputable breeders and sellers will do right by you as repeat sales are what keeps us going - even for a small homestead/hobby farm like us!
I bought 2 British Tailed Araucanas from a local breeder as pullets. One turned out to be a roo and she gladly swapped him for another pullet.
This is also one reason I only buy birds over 10 weeks. No suprises (well, usually) and I don't have the headache of trying to rehome roos.