Clients who have registered trademarks for their businesses should know that the USPTO is warning about non-official solicitations made to resemble official US trademark office documents. These solicitations could look like they are official bills. Some consumers have already complained about having paid fees to these companies, so clients should beware.
The USPTO website has more information and multiple examples of these documents. Keep an eye out and contact an attorney before sending any money to these companies, even if you think that it is the USPTO.