Isn't it standard practice for a competent lawyer to mail a demand letter for a client via certified mail with return receipt?

I hired an attorney to write a demand letter for me, and send it to a business owner who had hired me for a short term project, which I completed. I never got paid as the owner that hired me claims that he never hired me. Wouldn't it be standard practice when an attorney sends a demand letter with a cutoff date to pay to do so by certified letter w return receipt? The demand letter stated that he had to pay x amount by y date, or we would file a breach of contract lawsuit forthwith. In Nevada, you need to show proof that a demand letter be sent via certified mail w return receipt, before they will let you file a small claims lawsuit. My attorney sent the letter with a 49 cent stamp, no certified letter, and no return receipt!! And charged me $1000 and took 6 weeks to send it!!