WhatsApp Gold - It's a scam!
telling them to download this "premium" upgrade! It downloads a virus instead which alledgedly damages your smartphone/device beyond repair, I do not know how true this is however.
If you receive such a message, do not click to sign up for the promised upgrade. Instead, delete the message as soon as it is received. Remember that there’s only one version of WhatsApp which is already installed on your phone. Remember that updates are usually done automatically through the genuine app itself.