I bought socks in Pinduoduo, which said "five pairs, five pairs". Ten pairs have been distributed, and five pairs have been distributed. Is this cheating consumers and concealing the right to know?

It depends on how the seller announces the product specifications. If the seller buys five pairs and gives them five pairs, or an order is ten pairs and they give you five pairs, this may be a delivery error. Whether it is a fraudulent consumer depends on whether the seller has the subjective will to obtain improper benefits, and does not involve the right to know. It can be handled through negotiation or refund application, and there is no need to delve into the rights and interests.