Unable to withdraw. Kun platform website is invalid

The customer service first said the background system update and background URL update. Then, it is to replace the third-party payment channel. The withdrawal of 5,000 US dollars has been delayed. Then the URL is invalid. Account is invalid. The company customer service also ran away after sending a notice. There is $21,790 left in the background. With the withdrawal of $5,000, the total is $26,790. . . please help.