Unprofessional ethics and bad services received

On the 04 Oct I made an installment for Malta cupboards at mabopane Lewis store which amount to R64999, today they delivered a wrong cupboard, when I call the store they say it was their mistake the pricing was wrong on that thay, tried to call the store the manager doesn't want to answer, only the sales consultant exchange what'sup with me saying that the manager want me to pay the difference for the cupboards if I want them. So the manager want me to be accountable for the store mistake. I want the cupboards I pay for and they must come collect the one they delivered I don't want them.