Recommendation Cash Not Earned

I signed up on September 16th, but the cash wasn't credited.

I entered the friend invitation code, but it kept saying it was invalid. I exited to start over, but it turns out I was already signed up without an invitation.

I entered the code correctly several times, but it seems like a site error, so I couldn't receive the cash reward.

Please make corrections to earn cash.

There were continuous site errors on the 15th.

Invitation code HRZV5NMC

I couldn't find the customer service center, so I posted on the new member introduction board.