I’d suggest telling them it’s against Fiverr’s ToS, and then clicking on the Report button in the bottom right of the message.
Also, perhaps you could contact Customer Support and ask for their advice, what would they recommend you do when you receive such a message.
I have got this some of clients and i suggested to them that we can not beyond fiverr rules and regulation. Today i have got message related to Attention and found that was the error on every account "ATTENTION - ACCOUNT WARNING " , So i think i shoul go with support .
Reply to @techtransit: If any buyer messages you and asks you to contact them in a private email outside of Fiverr, report the buyer, do a mutual cancellation of the gig and contact customer support.
If anyone sent me contact information outside of fiverr I would tell them that is not allowed. If they did it again I would report them for it. I would also not try to do business with them and I would cancel their order.
Now I am doing same …