I received a response to my email from e-rewards today. Here's what it said:

"Good Day,

Thank you for contacting e-Rewards. We understand your frustration. We
are doing everything we can to credit your account as soon as possible.
We are currently researching your account regarding the Double Bonus
reward offer. We apologize for the delay and hope to have this resolved
very soon. We thank you for your patience."

We shall see. tls