I'm not a lawyer, but I expect you could create a shell company named Harmon, Kardon, Sennheiser, and Associates that was acting on behalf of Wonga, so long as

I'm not a lawyer, but I expect you could create a shell company named Harmon, Kardon, Sennheiser, and Associates that was acting on behalf of Wonga, so long as you identified yourself as a collection agency in the fine print and abided by all the laws pertaining to collections. I'm confident that even in the US you could expect a hefty fine if you made up fake law firms wholecloth, though.