Public trust sf-85P vs. dual citizenship

I did email a note “withdraw” to my agency one week ago. He replied to me “it was the last stop. Just waiting on adjudication. We should hear very soon.”.

However, the clearance process is still on going. e.g. work reference. My supervisor was got call from a male investigator. This was the different person who had interviewed me.

At this point, I really got confused the consequence. What’s the best effectively way to notify my agency to cancel the clearance? Shall I inform my investigator, too? if email was not good enough…Shall I be better to send a certified letter?

Please advice.
Thank you