You (anyone as well) have enough to work with.
Did he actually show you a cease and desist request and not let you keep it? Or do you have a copy of it you can share.
If he does not have a copy of it in hand they did not serve him. He also has to sign for it officially. There is a process. If that did not happen a court cannot honor it.
With my luck, the lawyer who penned it probably attended Penn State to earn his degree, whereupon I would've had to pay a translator to translate it into proper English.
I could only imagine one of the lines reading...
Please sease and digest talking about AMT's prodarak and what nut.