Alibaba manufacturer price increase after order placed

hello,

So I had agreed and approved my sample made of a tote bag with a supplier on Alibaba and placed a bulk order.

After selling my bags, I went to place another order and my supplier has said that there is an increase as they fired the last person because they under quoted me to try and get bonuses within their company.

they have now upped my sample price form $90 to $120 and put a 41% increase on my bulk unit price and also doubled my shipping.

has anyone else had this problem ? and how do I handle this?