Hello and welcome to BYC! Glad you joined.
Because you're not permitted to have roosters where you are there's no other choice than to rehome this cockerel. I would certainly reach out to the breeder and request that she take the bird back and either give you a refund or give you a pullet.
That seller got more money for that chick, presenting it to be a promising pullet. I would get back with the seller about this. They might help you out in some way. Wishing you good luck!