I referred several people using the 20k offer back in March. I then had 10k referral bonus points in my account within a few days of their approval. I spoke with a CSR and offered to send in screenshots showing the 20k bonus was offered. She didn't ask me to send in screenshots, but said she would "escalate" the case and that I should hear from them in about 7 days. I never did. Called back after 7 days and spoke to another CSR. He told me that I should have heard back already, and that he would see that the process was handled. Within a day or two I received an additional 10k for each approved referral.
It was relatively painless as the CSRs both seemed concerned and wanted to help. I just wish it was a better automated process that didn't require fight for it.