Good morning!I'm A partner visa and I want to...

Good morning!I'm A partner visa and I want to cancel it but the thing is I can't fine my sponsor and i don't have contact to him is there any options that I can do? because when I went to Amer they ask me the NSO stamp or signature of my company but the problem I can't find them and my PRO doesn't cooperate and now I can't contact him as well.what can I do sir/ma'am.thank you