i dont know who it is

See below for more info.

Its a Collin County Court Officer Doug.  He wants to serve you

They're a civil paper paper server company!
They are not associated with Collin Co Courts

Number is for a civil process paper serving co. Serveitup.com. They keep knocking on your door hoping that you will open up so they can give you civil papers from Portifolo Recovery Asso. a big debt collection co. who buys debt from credit card companies for pennies on the $  in hopes of filing suits in small claims court in hopes of collecting thousands