Pinduoduo was cheated. Can I get a refund when I enter Pinduoduo?

Yes, this dispute can be settled through negotiation first. If negotiation fails, it will be settled in court. The limitation period for requesting protection of civil rights from the people's court is three years. Where there are other provisions in the law, those provisions shall prevail.

Article 188 of the Civil Code of People's Republic of China (PRC)

The limitation period for requesting protection of civil rights from the people's court is three years. Where there are other provisions in the law, those provisions shall prevail. The limitation period of action shall be counted from the date when the creditor knows or should know that the right is damaged and the debtor knows it. Where there are other provisions in the law, those provisions shall prevail. However, the people's court shall not protect the rights that have been damaged for more than 20 years. Under special circumstances, the people's court may decide to extend the time according to the application of the obligee.